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River in Saskatchewan and Manitoba, Canada, and North Dakota, U.S. The Souris rises in southeastern Saskatchewan, then flows southeast into North Dakota, where it turns north to reenter Canada, joining the Assiniboine River in Manitoba after a course of 600 mi (966 km). In North Dakota it is also called the Mouse River.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Souris River, visit Britannica.com.
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