Sica Hollow displays many facets of natural history, including the glacial story of the River Warren, pothole lakes on the upland of Coteau, grasslands and prairie, and ravines where eastern deciduous forests grow. The site includes the eastern face of the escarpment of the Coteau des Prairies.
Year designated: 1967
Please remember, National Natural Landmarks (NNLs) are not national parks. NNLs are owned by a variety of public and private entities and allowing visitation is at their discretion. Many NNL sites maintain public websites where additional information may be found.