Person County contains parts of three major river basins: the Neuse, the Roanoke and the Tar, providing essential clean drinking water to the south and east of the state. The origin of the Tar River is in southeast Person County. In the northwest section of the county is Hyco Lake, with Mayo Reservoir in the northeast section. Both lakes are used for electrical power generation and recreation. Near the western border with Caswell County is Lake Roxboro. Part of the Neuse River begins here with the Flat River, where it combines with the Little and Eno rivers to go into Falls Lake and create the Neuse.