According to the United States Census Bureau, the township had a total area of 11.866 square miles (30.733 km2), including 11.603 square miles (30.051 km2) of land and 0.263 square miles (0.682 km2) of water (2.22%) [REF].
Mountain Lake is over 12,000 years old and is Warren County's largest, natural, glacial lake.