The Trinity River - See more below the photo.
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The Trinity River is a 710-mile long river that flows entirely within the U.S. state of Texas. It rises in extreme north Texas, a few miles south of the Red River. Its headwaters are separated from the Red River basin by the high bluffs on the south side of the Red River.
Robert Cavelier de La Salle in 1687 called the stream the "River of Canoes". The name "Trinity" came three years later in 1690 from Alonso De León, who called the stream the "La Santísima Trinidad" ("the Most Holy Trinity"). It is the second longest river entirely within one state in the country, trailing only Alaska's Kuskokwim River. Official river lengths always include the longest main watercourse/ tributary, in this case the West Fork, bringing the Trinity's total length to 710 miles.