Many of the Wisconsin's islands in Lake Michigan are around the Door Peninsula.

Washington Island is Wisconsin's largest in Lake Michigan and also has a year-round population of 708 as of the 2010 census.

Plum Island is home to a former Coast Guard Life-Saving Station and historic range lights.

[5] The islands surrounding the northern part of the peninsula are outcroppings of the Niagara Escarpment.

It can be reached by ferry and airplanes at Major Gilbert Field Airport.