[1] The park landscape is a generally flat till plain laid down during the formation and draining of glacial Lake Agassiz.

[4] Wave action and changes in lake level have created a ridge and swale pattern in the upland areas parallel to the lakeshore.

[4] The park has a network of small creeks and ponds draining generally towards the north east into the river and the bay.

[4] Drainage is slowed by the land profile creating a complex of marshlands, wet meadows, fens, and muskeg or bogs.

[4][1] The park is considered representative of the ecology of the Mid-Boreal Lowland Ecoregion within the Boreal Plains Ecozone.

[4] Plateau bogs develop slowly over time and can stand up to 2 metres (6.6 ft) above the surrounding ground level.

[4] The Mantagao River provides spawning habitat for northern pike, walleye, lake whitefish and freshwater drum.