Long Island is an 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...

 in 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...

 usually identified with 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...

. It is geologically different from the other islands, though, in that it is actually just an extension of the spit

Spit (landform)

A spit or sandspit is a deposition landform found off coasts. At one end, spits connect to land, and extend into the sea. A spit is a type of bar or beach that develops where a re-entrant occurs, such as at cove's headlands, by the process of longshore drift...

 off Chequamegon Point

Chequamegon Point

Chequamegon Point is a peninsula that extends into Chequamegon Bay of Lake Superior in northern Wisconsin in Ashland County, Wisconsin. Long Island is an extension of Chequamegon Point. Most of Chequamegon Point is owned by the Bad River Band of the Lake Superior Tribe of Chippewa Indians. There is...

. It is 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....

.

The island is 6.4 km long and between 75 and 380 meters wide.

According to USGS GNIS, there are 5 other islands with the same name in Wisconsin.