Fox River. I. A river of Wisconsin, called by the Indians Neenah. It rises in the S. central portion of the state, and flows first nearly S. W. to within 1 1/2 m. of the Wisconsin, when it turns suddenly X., and after a course of a few miles assumes a X. E. direction, passing through Lake Winnebago, and into the S. end of Green bay. The rapids in its lower course furnish immense water power. The channel has been improved so that steamboats pass from Green bay to Lake Winnebago. The subject of connecting the Fox and Wisconsin rivers by a ship canal, so as to admit vessels from Lake Michigan into the Mississippi river, has been much discussed, and a government survey of the route has been made. The whole length of Fox river is about 200 m.

II. Also called the Pishtaka, a river which rises in Waukesha co., Wisconsin, flows nearly due S. until it reaches Oswego, Illinois, when it turns S. W., and falls into the Illinois river at Ottawa, after a course of 200 m. It affords abundant water power.