Mexico rejected Texas’s claim that nine Río Bravo islands belong to it, underscoring that the border cannot be modified by a state government’s decision.

In an information note, the Mexican Foreign Affairs Secretariat stressed that the 1970 Boundary Treaty between the two countries establishes that, in Río Bravo, the international boundary runs through the center of the river’s normal channel.

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“That boundary determines the sovereignty of the lands on both sides of the border, regardless of the prior sovereignty those lands may have had,” the ministry said.

The authority also specified that the International Boundary and Water Commission (CILA) is the body empowered by both governments to apply the Treaty and determine which side of the boundary each island is on, and that no state authority has that attribution.

Under the pact, it added, neither country may build works that, in CILA’s judgment, could divert or obstruct the normal flow of the river.

🇲🇽🇺🇸 “Borders can’t be modified by a state government."

Mexico’s Secretariat of Foreign Affairs responded sharply to Texas officials claiming nine Río Grande islands, emphasizing that international treaties define the sovereign limits between Mexico and the U.S. pic.twitter.com/4hUw1vu0HL

— Voice of Mexico (@VOMexico) October 31, 2026

Texas authorities in the United States designated nine islands located on the water border between the two nations, at the level of its territory between Laredo and McAllen, as property of the demarcation. In a statement, Dawn Buckingham, the state’s land commissioner, granted authorization for the state’s Army to access those small territories with the purported objective of maintaining the “operational security” of the southern border.

Meanwhile, Mexico says it will closely monitor any action in the area and reiterated its commitment to compliance with the treaties governing the common border and to bilateral dialogue through the established mechanisms.

Amid questioned statements on security made by the United States since Donald Trump took the Presidency in 2025, Mexico has stressed the existence of bilateral coordination and collaboration, but without subordination and with unrestricted respect for sovereignty.

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