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 name of the river may come from the Blackfoot word "Mokowan" or "Mokoan", meaning stomach (the river was previously referred to as Mokowan River).
The river was the scene of the Battle of the Belly River between the Cree and the Blackfoot Confederacy in 1870.
The river gives the name to the Cretaceous age Belly River Formation, which was observed on its banks by George Mercer Dawson in 1883.
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