Delta Marsh

Delta Marsh consists of an extensive open marsh located near the south shore of Lake Manitoba, approximately 24 km north of the town of Portage la Prairie, Manitoba. The marsh extends for nearly 30 km along the shore of the lake, and has a breadth of up to 4 km. The marsh consists of a network of interconnected shallow bays separated from Lake Manitoba by a wooded barrier dune ridge of 300m to 600m width.

Despite its name, Delta Marsh is no longer a river delta. However, it was originally the delta of the Assiniboine River, which flowed into Lake Manitoba from the southwest until approximately 2500 years ago. (The current course of the river continues east past Lake Manitoba until it intersects the Red River in Winnipeg).