The Bark River is a tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the Rock River, about 67.5 miles (108.6 km) long, in southeastern 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...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. Via the Rock River, it is part of the watershed

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 of the Mississippi River

Mississippi River

The Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...

. According to the Geographic Names Information System

Geographic Names Information System

The Geographic Names Information System is a database that contains name and locative information about more than two million physical and cultural features located throughout the United States of America and its territories. It is a type of gazetteer...

, it has also been known historically as the "Peelbark River". The Bark River rises in southern Washington County and flows generally southwestwardly through Waukesha

Waukesha County, Wisconsin

Waukesha County is a county in the U.S. state of Wisconsin. As of 2008, the population was 380,629. Its county seat is Waukesha.-History:The part of Wisconsin that Waukesha County now occupies was a part of Michigan when Milwaukee County was organized in September 1834. On July 4, 1836, the...

 and Jefferson

Jefferson County, Wisconsin

Jefferson County is a county located in the U.S. state of Wisconsin. As of 2000, the population was 74,021. Its county seat is Jefferson.-Geography:According to the U.S...

 counties, past the communities of Hartland, Delafield

Delafield, Wisconsin

Delafield is a city in Waukesha County, Wisconsin, along the Bark River, and a suburb of Milwaukee. The population was 6,472 at the 2000 census....

 and Rome

Rome, Jefferson County, Wisconsin

Rome is a census-designated place in Jefferson County, Wisconsin, along the Bark River. The population was 689 at the 2010 census.-Geography:Rome is located at ....

, and through several small lakes. It joins the Rock River in Jefferson County just east of Fort Atkinson

Fort Atkinson, Wisconsin

Fort Atkinson is a city in Jefferson County, Wisconsin, United States. It is located on the Rock River, a few miles upstream from Lake Koshkonong. In 1996, Money Magazine named Fort Atkinson "One of America's Hottest Little Boomtowns." The population was 11,621 at the 2000 census.- History :Fort...

. In Jefferson County the Bark River collects the Scuppernong River

Scuppernong River (Wisconsin)

The Scuppernong River is a tributary of the Bark River, long, in southeastern Wisconsin in the United States. Via the Bark and Rock rivers, it is part of the watershed of the Mississippi River. It rises in southwestern Waukesha County and flows generally westwardly into Jefferson County, past...

.