Rock Island is a mostly wooded island off the tip of Wisconsin's Door Peninsula at the mouth of Green Bay, in Door County, Wisconsin. The 974.87-acre island is approximately 1.6 miles long and 1.1 miles wide. It rises to 65 meters above Lake Michigan, making it the highest in elevation out of all the Potawatomi Islands. It is almost entirely owned by the W…Rock Island is a mostly wooded island off the tip of Wisconsin's Door Peninsula at the mouth of Green Bay, in Door County, Wisconsin. The 974.87-acre island is approximately 1.6 miles long and 1.1 miles wide. It rises to 65 meters above Lake Michigan, making it the highest in elevation out of all the Potawatomi Islands. It is almost entirely owned by the Wisconsin Department of Natural Resources, which maintains Rock Island State Park. It is the northernmost part of the town of Washington.
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