Most of the rivers in Texas flow into this body of water
The water flows into canals creating a desert wetland full of aquatic 
creatures,... [DOC] [TLE] River Basins - Trinity River Basin | Texas Water Development Board [PAR] The basin's namesake river was named La Santisima Trinidad, "the Most Holy 
Trinity," ... the Trinity River flows to Trinity Bay, which drains to the Gulf of Mexico.