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Door County, Wisconsin, United States (44.76159 -87.53297)
The 102 ft high Brussels Hill (elevation 851 feet) is the highest named point in Door County. It has been explained as the result of a meteorite impact. The hill is missing blocks of rock ripped off during glaciation. The broken rocks leave behind nearly horizontal and vertical rock surfaces along the pre-existing weaknesses (beds and joints) in the rock. This is considered a feature of glaciokarst geology.