Cat Island is a Wisconsin

Wisconsin

Wisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...

 island in Lake Superior

Lake Superior

Lake Superior is the largest of the five traditionally-demarcated Great Lakes of North America. It is bounded to the north by the Canadian province of Ontario and the U.S. state of Minnesota, and to the south by the U.S. states of Wisconsin and Michigan. It is the largest freshwater lake in the...

. It is one of the Apostle Islands

Apostle Islands

The Apostle Islands are a group of 22 islands in Lake Superior, off the Bayfield Peninsula in northern Wisconsin. The majority of the islands are located in Ashland County—only Sand, York, Eagle, and Raspberry Islands are located in Bayfield County...

 and a part of the Apostle Islands National Lakeshore

Apostle Islands National Lakeshore

The Apostle Islands National Lakeshore is a U.S. national lakeshore consisting of 21 islands and shoreline encompassing 69,372 acres on the northern tip of Wisconsin on the shore of Lake Superior....

. It is located at 47°00′48"N 090°33′33"W. Variant names include Caterhemlock Island and Kagagiwanijikag Miniss. According to USGS GNIS, there is a smaller Cat Island in Brown County, Wisconsin just off shore of the city of Green Bay.

Cat Island has gone by a number of names including Kagagiwanjikag Miniss (Ojibwe for "Island of Hemlock Trees"), Texas Island, Hemlock Island and Shoe Island.