About: Arm River (Saskatchewan)

Arm River is a river in the Canadian province of Saskatchewan. It is located in the south central part of the province 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 river is a main tributary of Last Mountain Lake and is part of the Last Mountain Lake Sub-basin of the Upper Qu'Appelle Watershed. Last Mountain Creek drains Last Mountain Lake into the Qu'Appelle River near Craven.