Cabo Rojo and Laguna de Tamiahua, Mexico21.5N 97.3W
What at first appears to be a headland protruding from the east coast of Mexico is actually a sandbar enclosing a green lagoon that is a similar color to the nearby coastal plain.
This barrier of quartzite sand deposited adjacent to the coast of the Mexican state of Veracruz is Cabo Rojo (Spanish for “Red Cape”). It is located about 55 km (35 miles) south of the city of Tampico, Tamaulipas. It encloses the brackish lagoon called Laguna de Tamiahua.
As one of the few protruding features on this part of the coast, it may be regarded as the boundary between the western coasts of the Bay of Campeche and the Gulf of Mexico proper, and is frequently used by the authorities as a breakpoint for tropical cyclone warnings and watches.