Union Slough National Wildlife Refuge, nestled in north-central Iowa, preserves a unique pre-glacial riverbed and serves as a vital migratory waterfowl refuge. This 3,334-acre sanctuary offers diverse habitats including marsh, prairie, and river bottomland, providing a critical nesting and stopover site for birds in a landscape dominated by agriculture. Visitors can enjoy activities such as auto touring, fishing, hiking, hunting, wildlife viewing, and photography amidst its distinct ecological features.