The Oxnard Plain is a large coastal plain in southwest Ventura County, California, United States surrounded by the mountains of the Transverse ranges. The cities of Oxnard, Camarillo, Port Hueneme and much of Ventura as well as the unincorporated communities of Channel Islands, El Rio, Saticoy and Somis lie within the over . The is among the longest stretches of continuous, linear beaches in the state.