J. Clark Salyer National Wildlife Refuge protects a large wetland and river corridor in north-central North Dakota along the Souris River near the Manitoba border. Covering 58,693 acres and including roughly 75 miles of the river, it preserves part of a prairie river system shaped by floodplain conditions, shallow water, and seasonal marshes on the flat former bed of Glacial Lake Souris. First established in 1935 as the Lower Souris National Wildlife Refuge, it was renamed in 1967 for John Clark Salyer II, a leading figure in the growth of the national wildlife refuge system. It remains an important protected section of the Souris basin in the United States.