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There is one natural lake in Texas. It is Lake Caddo, in North East Texas. However, there are 190 man made lakes and reservoirs in Texas. Texas has 80,000 miles of rivers and streams. The longest river in Texas is the Rio Grande which is 1,254 miles long. Other major rivers in Texas are the Brazos River, Canadian River, Colorado River, Guadalupe, Nueces, Neches, Pecos River, Red River, Rio Grande, Sabine, Trinity River.