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The sanctuary is located between two beach ridges which were formed when glaciers and lake levels receded after the last ice age. Between the ridges is a swale that contains emergent wetlands with significant cattail composition and Frink’s Pond which is a depression that holds standing water in most years.
Jack pine, juniper, and little bluestem grass grow on the high sandy dunes. Wetland species such as long-billed marsh wren have used the marsh. Although the sanctuary is small, it is contained within a much larger wooded dune and swale complex.
For additional information, contact the MNA office at (866) 223-2231.