This southeast-looking, low-oblique, panoramic photograph of west-central Oklahoma shows three river systems that move generally west to east through the state—the Cimarron River; to its south the North Canadian River, which flows through Canton Lake (right of center) eastward into Oklahoma City; and farthest south, the South Canadian River, which flows generally southeastward. Situated on the Salt Fork of the Arkansas River, bright, white Great Salt Plains Lake [10 miles (16 kilometers) long], sometimes dry in the late summer and fall, is used for flood control and conservation.