The maritime boundaries between Mexico and the United States in the Pacific Ocean and Gulf of Mexico were established through a series of bilateral agreements that were reached in 1970, 1976, and 1978. In addition to the maritime space within 200 nautical miles from their respective coasts, Mexico and the United States have extended continental shelves in the Gulf of Mexico. The extended continental shelf boundary segments were delimited bilaterally; the “Western Gap” in 2000 and the “Eastern Gap” in 2017.

The Pacific Ocean boundary extends from the western land boundary terminus in a generally east to west direction for 306 nautical miles, while the Gulf of Mexico boundary extends from the eastern land boundary terminus in a generally west to east direction, for a total of 561 nautical miles, 214 of that being extended continental shelf.

Click here for information on the Mexico–United States land boundary that connects these two maritime boundaries.