Its only true opening to the Gulf of Mexico is through Brown Cedar Cut, near the north end of the peninsula.

Texas's East Matagorda Bay also includes a wide variety of plant species and vegetation either in the coastal wetlands or on solid land.

[7] In early January 1990, the carcasses of twenty-three Tursiops truncatus (Common Bottlenose Dolphin) were discovered off the inland coastline of East Matagorda Bay, TX.

There were few cases that reported dead or live Common Bottlenose Dolphins in East Matagorda Bay, before and after the mass die-off.

[8] Additionally, engineering programs such as the dredging of Mitchell's Cut,[9] meant to provide flood relief at the time, ended up altering points of access between East Matagorda Bay and the Gulf of Mexico.