The maritime boundary Agreement between Cuba and Mexico divides their overlapping entitlements in the Yucatán Channel. It was initially established in 1976 and originates in the north at the 200 nautical mile limits of Cuba and Mexico, which form part of an extended continental shelf area in the Gulf of Mexico commonly referred to as the “Eastern Gap.”  The maritime boundary then proceeds on its southerly course for 350 nautical miles until it reaches a tripoint with Honduras.

In 2017, Cuba and Mexico agreed to an extended continental shelf boundary in the “Eastern Gap.” It begins at point 1, the first point of the 1976 boundary, and extends northward for 33 nautical miles, passing through two turning points before terminating at point 4, a provisional, equidistance-based tripoint with the United States.