Justice Blackmun
delivered the opinion of the Court.
The question presented by this case is whether respondent’s suit against the United States is time barred. In 1954, the Government sold respondent’s interests in three Indian allotments to the United States Forest Service for inclusion in the Chippewa National Forest in Minnesota. Respondent claims that the sale was void. We hold that respondent’s suit is an action “to adjudicate a disputed title to real property in which the United States claims an interest,” within the meaning of the Quiet Title Act of 1972, 28 U. S. C. §2409a(a), and therefore is barred by that Act’s 12-year period of limitations. See 28 U. S. C. §2409a(f).
I
In 1905, pursuant to the General Allotment Act of 1887, 24 Stat. 388, as amended, 25 U. S. C. §331
et seq.
(1982 ed. and Supp. II), and the Nelson Act of 1889, 25 Stat. 642, three Chippewa Indian ancestors of respondent Florence Blacketter Mottaz each received an 80-acre allotment on the Leech Lake Reservation in Cass County, Minn.
Title to each of these allotments was held in trust by the United States. Respondent eventually inherited a one-fifth interest in one of the allotments and a one-thirtieth interest in each of the other two.
In the early 1950’s, some holders of fractional interests in Leech Lake allotments petitioned the Department of the Interior to permit them to sell their lands.
On April 30, 1953,
the Department’s Office of Indian Affairs sent respondent two forms, captioned “Consent to Sale of Inherited Lands.” App. 42, 43.
Accompanying the forms was a letter which read in part:
“As stated before, some of the owners have requested the sale of this land. Both land and timber, if any, have been appraised; and as soon as we get the consent to sell, an effort will be made to obtain a buyer by advertising for sale bids. This land will not be sold unless the high bid is equal to, or more than, the appraised value. If no reply is received from you within ten (10) days, it will be assumed that you have no objection to the sale.”
Id.,
at 15.
The consent forms indicated that one of the allotments was appraised at $420.50 and the other at $605.75. Respondent neither replied to the letter nor returned the consent forms. In 1954, despite the lack of express consent from every person who held an interest in any of the three allotments, the Government sold them to the United States Forest Service.
Respondent visited the regional office of the Bureau of Indian Affairs in May 1967 and expressed an interest in selling her inherited Indian lands. Later that month, the realty officer sent her a letter informing her of her allotment interests. The letter did not mention the Leech Lake allotments. Id., at 17. Respondent in 1981 again requested a list of her interests. In its reply, the Bureau set forth the allotments currently held in trust for her and, in addition, noted that she once had held interests in the Leech Lake allotments which had been sold by the Secretary as part of the so-called “Secretarial Transfer” program.
Id.,
at 44-45.
II
In 1981, respondent filed suit against the United States in the Federal District Court for the District of Minnesota. She claimed jurisdiction under 25 U. S. C. § 345, 28 U. S. C. §§1331, 1346, 1353, and 2415, and the Fifth Amendment. App. 7. She alleged that the sales of her three Leech Lake allotments “made without [her] consent or permission . . . were, therefore, illegal sales and transfers and are void.”
Id.,
at 8. In addition, respondent raised four other claims regarding the sale: that the United States had breached its fiduciary duty in selling lands held in trust for her without first obtaining her consent; that the United States had acted negligently in selling her lands; that she had been deprived of property without due process; and that her property had been taken for public use without just compensation.
Id.,
at 10. Respondent also sought to represent both a nationwide and a Minnesota-based class of similarly situated Indian claimants.
Id.,
at 8-9.
Respondent originally sought either “[d]amages in a monetary sum equal to the current fair market value of each parcel illegally transferred” or “rescission of the illegal sale or transfer and the vesting of title of each individual parcel in the names of the appropriate descendants, heirs and assigns.”
Id.,
at 10. After a preliminary hearing, she voluntarily dismissed, without prejudice, her claim requesting rescission.
Id.,
at 12.
The District Court ruled that respondent’s claims were barred by 28 U. S. C. § 2401(a), the general statute of limitations governing actions against the United States. That sec
tion provides, in pertinent part, that “every civil action commenced against the United States shall be barred unless the complaint is filed within six years after the right of action first accrues.” The court held that respondent’s cause of action first accrued when she learned of the sale of the lands. Since respondent’s deposition “clearly reveal[ed] that she had knowledge of the sale in 1954,” App. to Pet. for Cert. 10a, her suit, filed 27 years after the sale, was barred.
The Court of Appeals reversed and remanded. 753 F. 2d 71 (CA8 1985). While it recognized that respondent’s complaint was somewhat opaque, it rejected the Government’s claim that respondent was seeking, not simply to establish title to the allotments, but also to obtain damages for alleged negligence and breach of fiduciary duty: the complaint “must be read as raising the one essential claim that her land was sold without her consent, that she did not receive payment for her land, and that accordingly the sale was void and she retains title to the land.” Id., at 75. The claim for damages equal to the current fair market value of the land “must be construed as equivalent to a claim for return of the land itself.”
Ibid.
The Court of Appeals ruled that such a claim could not be time barred. This Court in
Ewert
v.
Bluejacket,
259 U. S. 129 (1922), had held that the sale of an allotment to a Government agent in violation of federal law is “ ‘void and confers no
right upon the wrongdoer,’”
id.,
at 138, quoting
Waskey
v.
Hammer,
223 U. S. 85, 94 (1912), and had refused to apply principles of laches to bar the Indians’ claim against Ewert. Although
Ewert
v.
Bluejacket
did not consider whether federal statutes of limitations apply to land claims brought by Indian allottees, the Court of Appeals found that § 2401(a) “does not bar claims of title to allotments because
Ewert
is based on the principle that, if the underlying sale of land is void, the concept that a cause of action ‘accrues’ at some point is inapplicable because the allottee simply retains title all along.” 753 F. 2d, at 74.
Thus, the Court of Appeals concluded that the statute of limitations question depended on the resolution of several preliminary issues. It therefore remanded the case to the District Court to determine whether the Secretary lacked the authority in 1954 to sell respondent’s lands without her consent, and, if such a sale would have been unauthorized, whether respondent either had consented or had actually received payment following the sale, in which case her consent could be inferred. If respondent proved on remand that the sale was illegal, then, “[i]n light of the land’s inclusion within the Chippewa National Forest and the thirty years which have passed since the sale, . . . she may force the government to pay her the fair market value of the land rather than to simply return the land itself.”
Id.,
at 75.
The Government petitioned for rehearing and rehearing en banc. In its petition, the Government claimed, apparently for the first time, that respondent’s suit to recover land currently held by the United States was barred, not by the general 6-year statute of limitations in § 2401(a), but rather by the 12-year limitations period established by the Quiet Title Act. 2 Record 16. In addition, the Government argued that the Court of Appeals’ holding that respondent could compel the United States to pay her the fair market value of her property involved relief “of the type typically provided by the Tucker Act,”
ibid.,
but a Tucker Act claim would
clearly be barred by the 6-year statute of limitations. The Court of Appeals denied the Government’s petition. App. to Pet. for Cert. 13a. Because of the importance of the issue, we granted certiorari to consider whether respondent’s claim was barred under either § 2401(a) or §2409a(f), the limitations provision governing Quiet Title Act claims. 474 U. S. 994 (1985).
Ill
When the United States consents to be sued, the terms of its waiver of sovereign immunity define the extent of the court’s jurisdiction.
United States
v.
Sherwood,
312 U. S. 584, 586 (1941). In particular, “[w]hen waiver legislation contains a statute of limitations, the limitations provision constitutes a condition on the waiver of sovereign immunity.”
Block
v.
North Dakota,
461 U. S. 273, 287 (1983). Neither the District Court nor the Court of Appeals discussed the precise source of its jurisdiction, and the parties at various times before this Court have identified the jurisdictional basis of respondent’s suit as the Quiet Title Act, 28 U. S. C. §§ 1346(f) and 2409a; the Allotment Acts, 25 U. S. C. §345 and 28 U. S. C. § 1353; and the Tucker Act, 28 U. S. C. § 1346(a)(2). Thus, we must decide which, if any, of these statutes conferred jurisdiction on the District Court and the Court of Appeals, and then determine whether respondent’s suit was brought within the relevant limitations period.
A
In
Block
v.
North Dakota,
461 U. S., at 286, this Court held that “Congress intended the QTA to provide the exclusive means by which adverse claimants could challenge the United States’ title to real property.” Here, respondent contests the United States’ claim that it acquired title to the allotments in 1954. We think that respondent’s suit falls within the scope of the Quiet Title Act, 28 U. S. C. § 2409a(a), which governs “civil action[s] ... to adjudicate a disputed title to real property in which the United States
claims an interest.” Respondent’s description of her claim clearly brings it within the Act’s scope:
“At no time in this proceeding did respondent drop her claim for title. To the contrary, the claim for title is the essence and bottom line of respondent’s case. Her position is simply that the land remains in the name of Mottaz and the other heirs of the property despite what some pieces of paper executed by petitioner without her consent and without a court hearing purport to do.” Brief for Respondent 3.
See also 753 F. 2d, at 74, 75. The relief respondent seeks confirms this characterization of her suit. Respondent does not seek recovery of her share of the proceeds realized by the United States from the 1954 sale but allegedly never distributed. A claim for monetary damages in that amount would involve a concession that title had passed to the United States Forest Service in 1954 and that the sole issue was whether respondent was fairly compensated for the taking of her interests in the allotments. Rather, respondent demands damages in the amount of the
current
fair market value of her interests. What respondent seeks is a declaration that she alone possesses valid title to her interests in the allotments and that the title asserted by the United States is defective, and an order requiring the United States to pay her the value of her interest today in order properly to transfer title.
Nonetheless, respondent claims that her suit is not governed by the Quiet Title Act because, by its own terms, that Act “does not apply to trust or restricted Indian lands,” § 2409a(a), such as the lands in which she asserts an interest. Respondent misconstrues this exclusion, which operates solely to retain the United States’ immunity from suit by third parties challenging the United States’ title to land held in trust for Indians. See,
e. g.,
S. Rep. No. 92-575, p. 6 (1971); H. R. Rep. No. 92-1559, p. 13 (1972); Dispute of Titles on Public Lands, Hearing on S. 216, S. 579, and S. 721
before the Subcommittee on Public Lands of the Senate Committee on Interior and Insular Affairs, 92d Cong., 1st Sess., 19 (1971). Thus, when the United States claims an interest in real property based on that property’s status as trust or restricted Indian lands, the Quiet Title Act does not waive the Government’s immunity.
Here, however, the United States claims an interest in the Leech Lake lands, not on behalf of Indian beneficiaries of a trust, but rather on behalf of the United States Forest Service and the Chippewa National Forest. Thus, the Act provides the United States’ consent to suit concerning its claim to these lands, provided, of course, that the plaintiff challenging the Government’s title meets the conditions attached to the United States’ waiver of immunity.
The limitations period is a central condition of the consent given by the Act. See,
e. g., Block,
461 U. S., at 283-285; H. R. Rep. No. 92-1559,
supra,
at 5, 7-8. The Act provides:
“Any civil action under this section shall be barred unless it is commenced within twelve years of the date upon which it is accrued. Such action shall be deemed to have accrued on the date the plaintiff or his predecessor in interest knew or should have known of the claim of the United States.” 28 U. S. C. §2409a(f).
The District Court expressly found that respondent knew of the sale in 1954. Moreover, the list of interests provided to respondent by the Bureau of Indian Affairs in 1967 did not include any of the three Leech Lake allotments. Thus, by
1967, at the very latest, respondent was on notice that the Government did not recognize her title to the allotments. Whether respondent actually knew that the allotments had been included within the Chippewa National Forest and thus were claimed by the United States, her undisputed knowledge that the Government no longer recognized
her
as having a valid claim to the allotments satisfies the “should have known” prong of § 2409a(f)’s accrual test.
Her claim is therefore barred.
B
Respondent, however, seeks to avoid the carefully crafted limitations of the Quiet Title Act by characterizing her suit as a claim for an allotment under the General Allotment Act of 1887, 24 Stat. 388, as amended, 25 U. S. C. § 331
et seq.
(1982 ed. and Supp. II). That Act grants jurisdiction to the district courts over suits “involving the right ... to any allotment.” 25 U. S. C. §345.
Respondent claims that the
general 6-year statute of limitations governing all civil actions against the Government, 28 U. S. C. § 2401(a), does not apply to cases brought under the General Allotment Act, and that her claim therefore cannot be time barred. We need not reach the question whether § 2401(a) applies to claims brought under § 345 of the General Allotment Act, and, if it does, when a cause of action begins to run, since we conclude that respondent cannot use §345 for a quiet title action against the Government.
Section 345 grants federal district courts jurisdiction over two types of cases: (i) proceedings “involving the right of any person, in whole or in part of Indian blood or descent, to any allotment of land under any law or treaty,” and (ii) proceedings “in relation to” the claimed right of a person of Indian descent to land that was once allotted. Section 345 thus contemplates two types of suits involving allotments: suits seeking the issuance of an allotment, see,
e. g., Arenas
v.
United States,
322 U. S. 419 (1944), and suits involving “‘the interests and rights of the Indian in his allotment or patent after he has acquired it,’”
Scholder
v.
United States,
428 F. 2d 1123, 1129 (CA9), cert. denied, 400 U. S. 942 (1970), quoting
United States
v.
Pierce,
235 F. 2d 885, 889 (CA9 1956).
The structure of §345 strongly suggests, however, that § 345 itself waives the Government’s immunity only with respect to the former class of cases: those seeking an original
allotment. In those suits, §345 provides that “the parties thereto
shall be
the claimant as plaintiff and the United States as party defendant” (emphasis added), while, as to the latter class of cases, no mention of the United States’ participation is made.
Accordingly, in
Affiliated Ute Citizens
v.
United States,
406 U. S. 128 (1972), this Court held that, to the extent that § 345 involves a waiver of federal immunity, as opposed to a grant of subject-matter jurisdiction to the district courts, that section “authorizes, and provides governmental consent for, only actions
for
allotments.” 406 U. S., at 142 (emphasis added). See also
Naganab
v.
Hitchcock,
202 U. S. 473 (1906) (sovereign immunity precludes suit against United States regarding disposition of Indian lands).
That federal courts may have general subject-matter jurisdiction over claims to quiet title to allotments brought by Indians, see n. 9,
supra,
does not therefore mean that the United States has waived its immunity in cases where an Indian challenges the United States’ claim of title in its own right. As the Court already has noted, Congress intended the Quiet Title Act “to provide the exclusive means by which adverse claimants [can] challenge the United States’ title to real property.”
Block,
461 U. S., at 286. In
Block,
the State of North Dakota sued the federal officers responsible for supervising a riverbed within the State which both the State and the Federal Government claimed to own and
sought an injunction barring them from exercising privileges of ownership over the bed. The Court held that such an “officer’s suit” was precluded since it would circumvent the “carefully crafted provisions of the QTA deemed necessary for the protection of the national public interest.”
Id.,
at 284-285. To permit challenges to the Government’s claim of title to be brought under other jurisdictional provisions might mean that “the QTA’s 12-year statute of limitations, the one point on which the Executive Branch was most insistent, could be avoided, and, contrary to the wish of Congress, an unlimited number of suits involving stale claims might be instituted.”
Id.,
at 285. Moreover, to permit officer’s suits might thwart Congress’ determination that the Government be given the option of paying just compensation and thereby keeping land even after an adverse judgment, see § 2409a(b), in order to avoid disruption of ongoing federal activities involving the disputed property. 461 U. S., at 285.
To permit suits against the United States under the General Allotment Act poses similar dangers. Not only could it permit plaintiffs to avoid the Quiet Title Act’s 12-year statute of limitations, but it could also seriously disrupt ongoing federal programs. The remedial clause of the General Allotment Act provides that a judgment in favor of an Indian claimant “shall have the same effect... as if such allotment had been allowed and approved by [the Secretary of the Interior].” 25 U. S. C. § 345. Thus, if plaintiffs were permitted to sue under the General Allotment Act, they would be entitled to actual possession of the challenged property. This would pose precisely the threat to ongoing federal activities on the property that the Quiet Title Act was intended to avoid. That the plaintiff in this case claims the right to elect a remedy that would not require the Government to relinquish its possession of the disputed lands is irrelevant: the Quiet Title Act expressly gives that choice to the Government, not the claimant. 28 U. S. C. §2409a(b). In light of Congress’ purposes in enacting the Quiet Title Act, we can
not conclude that Congress intended to permit persons in respondent’s position to avoid that Act’s strictures.
C
At oral argument, respondent claimed that her case is based solely on the General Allotment Act. See Tr. of Oral Arg. 23, 26. Nevertheless, at various times during this litigation, both parties have identified the Tucker Act as providing a source of federal jurisdiction over respondent’s claims. Although respondent and the Government apparently agree that a suit based on the Tucker Act would be barred by the general 6-year statute of limitations, 28 U. S. C. § 2401(a), we must address the possibility that the District Court’s jurisdiction rested on the Tucker Act because, if it did, the Court of Appeals for the Eighth Circuit may have lacked jurisdiction over respondent’s appeal.
Prior to the passage of the Quiet Title Act, adverse claimants had resorted to the Tucker Act to circumvent the Government’s immunity from quiet title suits. Rather than seeking a declaration that they owned the property at issue, such claimants would concede that the Government possessed title and then would seek compensation for the Government’s having taken the property from them. See
Block,
461 U. S., at 280-281; H. R. Rep. No. 92-1559, at 9, 12. In
light of the Quiet Title Act’s explicit statement that § 2409a(a) does not “apply to or affect actions which may be or could have been brought under sections 1346 . . . [or] 1491 ... of this title,”
we cannot conclude that Tucker Act-based suits, like the officer’s suit at issue in
Block,
are clearly precluded by the passage of the Quiet Title Act.
But regardless of whether other claimants may invoke the district courts’ Tucker Act jurisdiction to hear their claims, it is clear that respondent has not brought a case falling within the scope of the Tucker Act. In
Healy
v.
Sea Gull Specialty Co.,
237 U. S. 479, 480 (1915), Justice Holmes, writing for a unanimous Court, stated that “the plaintiff is absolute master of what jurisdiction he will appeal to,” and noted that “[jjurisdiction generally depends upon the case made and relief demanded by the plaintiff.” Thus, since the “essential features,”
id.,
at 481, of Healy’s case involved allegations of patent infringement and a request for the relief characteristically provided by patent law, Healy could invoke federal patent law jurisdiction despite the fact that the measure of damages was fixed by contract.
Respondent now invokes federal jurisdiction only under the General Allocation Act and its jurisdictional counterpart. Moreover, the case she has made, and the relief she seeks, do not fit within the scope of the Tucker Act. A Tucker Act-based lands suit would seek damages equal to just compensation for an already completed taking of the claimant’s land. See,
e. g., Block,
461 U. S., at 280-281; H. R. Rep. No. 92-1559, at 7, 9, 12-13. As we have noted, however, respondent is not seeking whatever compensation she allegedly
was denied in 1954. Rather, she claims she still owns her interests in the allotments, and she seeks to force the Government to buy those interests. She claims, in essence, that no legally cognizable taking has yet occurred. See Brief for Respondent 3-4. Respondent and the Court of Appeals view payment rather than return of the land as an appropriate remedy because respondent’s allotments now lie within the Chippewa National Forest. But neither views this payment as representing damages for the Government’s past acts, the essence of a Tucker Act claim for monetary relief. See,
e. g., United States
v.
Mitchell,
463 U. S. 206 (1983). Since this Indian respondent’s claim was not based on the Tucker Act, her appeal to the Court of Appeals for the Eighth Circuit was proper.
IV
Federal law rightly provides Indians with a range of special protections. But even for Indian plaintiffs, “[a] waiver of sovereign immunity ‘cannot be lightly implied but must be unequivocally expressed.’”
United States
v.
Mitchell,
445 U. S. 535, 538 (1980), quoting
United States
v.
King,
395 U. S. 1, 4 (1969). Congress has consented to a suit challenging the Federal Government’s title to real property only if the action is brought within the 12-year period set by the Quiet Title Act. The limitations provision of the Quiet Title Act reflects a clear congressional judgment that the national public interest requires barring stale challenges to the United States’ claim to real property, whatever the merits of those challenges. Accordingly, the judgment of the Court of Appeals is reversed.
It is so ordered.