Toledo Bend Reservoir is a reservoir on the Sabine River between Texas and Louisiana. The lake has an area of 185,000 acres (750 km2), the largest man-made body of water partially in both Louisiana and Texas, the largest in the South, and the fifth largest by surface acre in the United States. The dam is capable of generating 92 megawatts of electrical power. The dam itself is located in the northeast corner of Newton County, Texas; however, that county includes very little of the reservoir, as most of it extends northward into parts of Sabine and DeSoto parishes in Louisiana, and Sabine, Shelby, and Panola counties in Texas.

The Sabine River is a 360-mile (580 km) long river in the Southern U.S. states of Texas and Louisiana, From the 32nd parallel north and downstream, it serves as part of the boundary between the two states and empties into Sabine Lake, an estuary of the Gulf of Mexico.