How far does the eastern boundary of Texas extend into the Gulf of Mexico from the mouth of the Sabine River according to historical law?

The eastern boundary of Texas extends into the Gulf of Mexico from the mouth of the Sabine River by a distance of 3 marine leagues, which is consistent with historical legal definitions and boundaries established when Texas was a part of Mexico. A marine league is traditionally recognized as approximately three statute miles. Hence, the boundary extends for about 9 statute miles into the Gulf of Mexico, marking the limit of Texas's jurisdictional reach into the water.

This definition stems from various legal interpretations and historical agreements dating back to the era of independence and annexation, where such distances were used to delineate coastal boundaries. It is crucial for surveyors and land use planners in Texas to understand these boundaries for legal, regulatory, and planning purposes, as they influence maritime jurisdiction, resource management, and environmental regulations in coastal areas.