Emajõe-Suursoo Nature Reserve (Estonian: Emajõe-Suursoo maastikukaitseala) is a nature reserve in Tartu County, Estonia, located around the estuary of the Emajõgi River, on the southwestern coast of Lake Peipus. Emajõe-Suursoo is one of the oldest and at 200 square kilometres (77 sq mi) the largest of the delta swamps in Estonia. The reserve was established in 1981.