Moose Mountain Creek is a river in the Canadian province of Saskatchewan. Its source is the Chapleau Lakes near Montmartre and it is a tributary of the Souris River, which, in turn, is a tributary of the Assiniboine River. The whole system is part of the Red River watershed, which is part of the Hudson Bay drainage basin and in a region called the Prairie Pothole Region of North America, which extends throughout three Canadian provinces and five U.S. states. It is also within Palliser's Triangle and the Great Plains ecoregion.

The Souris River or Mouse River is a river in central North America. Approximately 435 miles (700 km) in length, it drains about 23,600 square miles (61,100 km2) in Canada and the United States.