The Beaver River is the historic name for an intermittent river in Oklahoma that drains most of the Oklahoma Panhandle. It is also known as the North Canadian River. Both names are in common use. By one convention the headwaters of the Beaver River are at the convergence of the Corrumpa, Rafael, and Cienequilla Creeks west of Grenville, New Mexico. By other conventions the name arbitrarily changes at the New Mexico/Oklahoma border, or further east; upstream, USGS topographic maps mark the stream "Corrumpa Creek", downstream the maps mark the stream either "Beaver River" or "North Canadian River". The Beaver River flows from Union County, New Mexico, across the three Oklahoma Panhandle counties, Cimarron, Texas, and Beaver. At Ft. Supply in Harper County, Oklahoma, the Beaver comes to a confluence with Wolf Creek and becomes known as the North Canadian River.