Lake o' the Pines is a reservoir located in northeast Texas, near the town of Jefferson. The lake was formed in 1958 with the construction of a dam on Big Cypress Bayou. The area around the lake was historically inhabited by various Native American tribes, including the Caddo and Cherokee. The lake provides water for various uses, including irrigation, recreation, and municipal supply. The hydrology of the lake is influenced by the watersheds of the Big Cypress and Little Cypress Bayous. The lake is also fed by surface flow and snowpack from the surrounding area. Agricultural uses in the region include livestock grazing and timber production. Recreational activities at the lake include boating, fishing, and camping.