
    UNITED STATES of America, Plaintiff-Appellee, v. Danfi Gonzalez IGUARAN, Defendant-Appellant.
    No. 15-13659
    Non-Argument Calendar.
    United States Court of Appeals, Eleventh Circuit.
    May 12, 2016.
    Evelyn Baltodano-Sheehan, Monique Botero, Wifredo A. Ferrer, Lisette Marie Reid, Emily M. Smachetti, U.S. Attorney’s Office, Miami, FL, for Plaintiff-Appellee.
    Andrew L. Adler, Federal Public Defender’s Office, Fort Lauderdale, FL, Michael Caruso, Federal Public Defender Federal Public Defender’s Office, Miami, FL, for Defendant-Appellant.
    
      Before ED CARNES, Chief Judge, MARTIN and ANDERSON, Circuit Judges. -
   PER. CURIAM:

Danfi Gonzalez Iguaran pleaded guilty to one count of conspiring to distribute cocaine while on board a vessel subject to the jurisdiction of the United States, in violation of. the Maritime Drug Law Enforcement Act (MDLEA), 46 U.S.C. §§ 70503(a)(1), 70506(b). On appeal, he contends for the first time that, the district court did not have subject matter jurisdiction because the record does not establish that the vessel in which he was apprehended was subject to the jurisdiction of the United States;

As an initial matter, the government contends that we should review only for plain error because Iguaran did not raise his jurisdictional objection-in the district court. The ¡ government is wrong. See McCoy v. United States, 266 F.3d 1245, 1249 (11th Cir.2001) (“[JJurisdictional errors are not subject to plain- or harmless-error analysis”). The district court’s subject matter jurisdiction is a question of law that we review de novo even when it is raised for the first time on appeal. See United States v. Giraldo-Prado, 150 F.3d 1328, 1329 (11th Cir.1998); see also Henderson ex rel. Henderson v. Shinseki, 562 U.S. 428, 434, 131 S.Ct. 1197, 1202, 179 L.Ed.2d 159 (2011) (noting that “[ojbjec-tions to subject-matter jurisdiction ... may be raised at any time”); United States v. Cotton, 535 U.S. 625, 630, 1221 S.Ct. 1781, 1785, 152 L.Ed.2d 860 (2002) (“[Djefects in subject-matter jurisdiction require correction regardless of whether the error was raised in district court.”). We review for clear error the district court’s factfindings relevant to jurisdiction. United States v. Tinoco, 304 F.3d 1088, 1114 (11th Cir.2002).

The MDLEA makes it a crime to conspire to distribute a controlled substance while on board “a vessel subject to the jurisdiction of the United States.” 46 U.S.C. §§ 70503(a)(1), 70506(b). The Act also states that “[¿jurisdiction of the United’ States with respect to a vessel subject to this chapter is not an element of an offense” ‘ and that “[¿jurisdictional issues arising under this chapter are preliminary questions of law to be determined solely by the trial judge.” 46 U.S.C, § 70504(a). Based on that language, this Court has “interpreted the ‘on board a vessel subject to the jurisdiction of the United States’ portion of the MDLEA as a congressionally imposed limit on courts’ subject matter jurisdiction, akin to the amount-in-controversy requirement contained in 28 U.S.C. § 1332.” United States v. De La Garza, 516 F.3d 1266, 1271 (11th Cir.2008); see also United States v. Betancourth, 554 F.3d 1329, 1332-33 (11th Cir.2009). Thus, “for a district court to have ’ adjudicatory authority over a charge that a defendant conspired to violate the substantive crime defined in [the MDLEA], the Government must preliminarily show that the conspiracy’s vessel was, when apprehended, subject to the jurisdiction of the United States.” De La Garza, 516 F.3d at 1272 (quotation marks omitted).

The MDLEA identifies various circumstances that would render a vessel subject to the jurisdiction of the United States. For example, “a vessel without nationality” counts as a “vessel subject to the jurisdiction of the United States” for purposes of the MDLEA. 46 U.S.C. § 70502(c)(1)(A). In turn, the term “vessel without nationality” includes “a vessel aboard which the master or individual in charge fails, on request of an officer of the United States authorized to enforce applicable provisions of United States law, to make a claim of nationality or registry for that vessel.” Id. § 70502(d)(1)(B). Under those definitions, if Iguaran and his coconspirators failed, on request of the United States officials who apprehended them, ■■•to ■ “make a claim of nationality,” their vessel was “without nationality” and “subject to the jurisdiction of the United States.”

In this case, the district court did not expressly make any factual findings with respect to its jurisdiction. The government contends, however, that Iguararis plea agreement, which was consistent with his factual proffer and presentence investigation report,- establishes the district court’s jurisdiction. In the plea agreement, Iguaran''agreed to plead guilty to conspiring to possess with intent to distribute cocaine “with individuals who were on board a vessel that was subject to the jurisdiction of the United States'.” That statement, the government appears to-argue, constitutes an admission of jurisdiction.

The government’s argument fails because, as we have' repeatedly held, “tpjarties may not stipulate jurisdiction.” W. Peninsular Title Co. v. Palm Beach Cty., 41 F.3d 1490, 1492 n. 4 (11th Cir.1995); see also Travaglio v. Am. Express Co., 735 F.3d 1266, 1269-70 (11th Cir.2013) (“[I]t is fundamental that parties may not stipulate to federal jurisdiction.”); Bush v. United States, 703 F.2d 491, 494 (11th Cir.1983) (“The mere’ fact that the parties stipulated to jurisdiction does not automatically vest authority in the district court to adjudicate all the issutes' presented, for subject'matter jurisdiction cannot be assumed by the court nor can it be waived by the parties.”).'- Parties may, howevér, “stipulate to facts thkt bear oh our jurisdictional inquiry.” ’ Eng’g Contractors Ass’n of S. Fla. v. Metro. Dade Cty., 122 F.3d 895, 905 (11th Cir.1997); see also Ry. Co. v. Ramsey, 89 U.S. (22 Wall.) 322, 327, 22 L.Ed. 823 (1874). A court’s task-is to determine whether" “the stipulated facts give rise to jurisdiction.” W. Peninsular Title Co., 41 F.3d at 1492 n. 4 (emphasis omitted).

In the plea agreement,-Iguaran does not admit to, facts that give, ripe to jurisdiction. The agreement does not state, for example, that Iguaran and his coconspirators failed to “make a claim of nationality” upon request when United States officials apprehended thqm. Instead, it asserts that Iguaran was on a vessel. subject to the United States’ jurisdiction. . That is a question of law and one which, as we have already explained, parties may not stipulate or admit to. See Travaglio, 735 F.3d at 1269-70; W. Peninsular Title Co., 41 F.3d at 1492 n. 4; Bush, 703 F.2d at 494. Iguararis factual proffer, his presentence investigation report,, and. the transcript from his change of plea hearing also fail to supply facts which establish that Iguararis vessel was subject to the jurisdiction of the' United States; And the record, is, devoid of any other facts that would’ provide a basis for. federal subject matter jurisdiction, As a result, we are unable to determine whether the district court had jurisdiction over Iguararis case.

The government points out that one of Iguararis coconspirators, in. a separate proceeding against him, admitted to facts that would establish jurisdiction in his case. For example, that coconspirator admitted in his plea agreement that when they were apprehended “none of the defendants claimed to be the master of the vessel,” “none made a claim of nationality,” and the vessel “was, therefore, a stateless vessel subject to the jurisdiction of the United States.” His admission is irrelevant here because the question is whether the record in Iguaran’s case, not some other case, establishes jurisdiction. It does not.

When a party’s failure to challenge the district court’s jurisdiction is at least partially responsible for the lack of a developed record, we have said that “the proper course of action ... is to remand the case to the district court for factual findings” as to jurisdiction. Williams v. Best Buy Co., 269 F.3d 1316, 1320 (11th Cir.2001); see also Belleri v. United States, 712 F.3d 543, 548 (11th Cir.2013) (stating that when we discover “a serious question regarding the factual predicate for subject-matter jurisdiction, we should remand for a finding to resolve the jurisdictional question”) (quotation marks and alteration omitted); Rolling Greens MHP, LP v. Comcast SCH Holdings LLC, 374 F.3d 1020, 1020-21 (11th Cir.2004) (remanding to the district court “for limited purpose of determining whether diversity jurisdiction exists”). Although neither side requests it, a limited remand is the proper course of action in this case.

We therefore remand the case to the district court for the limited purpose of determining whether subject matter jurisdiction exists. On limited remand, the government “should be afforded an opportunity to submit evidence in support of its assertion” that Iguaran’s vessel was subject to the jurisdiction of the United States, and Iguaran should be afforded an opportunity to present evidence that it was not. Williams, 269 F.3d at 1321. The district court should then determine whether the government has carried its burden of establishing that the vessel in which Iguaran was apprehended was subject to the jurisdiction of the United States. If the court determines that the government has proven that, it should reinstate Iguaran’s conviction; if the court determines that the government has not proven that, it should enter a judgment dismissing for lack of jurisdiction the charge against Iguaran.

The judgment is VACATED and the case is REMANDED for further proceedings consistent with this opinion. 
      
      . In support of its argument that plain error review applies, the government relies on our unpublished decisions in United States v. Estrada-Obregon, 270 Fed.Appx. 978 (11th Cir.2008), and United States v. Madera-Lopez, 190 Fed.Appx. 832 (11th Cir.2006). Neither decision constitutes binding precedent. See llth Cir. R. 36-2 ("Unpublished opinions are not considered binding precedent."); United States v. Irey, 612 F.3d 1160, 1215 n. 34 (11th Cir.2010) ("Unpublished opinions are not precedential — ”),
     