Belly River

Belly River is a river in northwest Montana, United States and southern Alberta, Canada. It is a tributary of the Oldman River, itself a tributary of the South Saskatchewan River.The Belly River originates in northwestern Montana, United States in Helen Lake, at the feet of Ahern Peak in Glacier National Park. It flows north across the 49th parallel north into Alberta near Chief Mountain, in the east of the Waterton Lakes National Park.