East Matagorda Bay, off Matagorda County on the Texas

Texas

Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

 coast (at 28°43' N, 95°49' W), is enclosed by the Matagorda Peninsula

Matagorda Peninsula

The Matagorda Peninsula is a narrow spit of land on the southeastern coast of Texas in the United States.The peninsula is in Matagorda County, Texas. It lies between Matagorda Bay, an estuary, and the Gulf of Mexico, and water is exchanged between the two through five main tidal...

 and the tidal flats at the mouth of the Colorado River. Its only true opening to the Gulf of Mexico

Gulf of Mexico

The Gulf of Mexico is a partially landlocked ocean basin largely surrounded by the North American continent and the island of Cuba. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. In...

 is through Brown Cedar Cut, near the north end of the peninsula.

It is part of the Matagorda Bay

Matagorda Bay

Matagorda Bay is a large estuary bay on the Texas coast, lying in Calhoun and Matagorda counties and located approximately northeast of Corpus Christi, southeast of San Antonio, southwest of Houston, and southeast of Austin. It is separated from the Gulf of Mexico by Matagorda Peninsula and...

system, the third largest estuarine system in the state of Texas.