The Pond River is a 90.8 miles (146.1 km) 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 Green River

Green River (Kentucky)

The Green River is a tributary of the Ohio River that rises in Lincoln County in south-central Kentucky. Tributaries of the Green River include the Barren River, the Nolin River, the Pond River and the Rough River...

 in western Kentucky

Kentucky

The Commonwealth of Kentucky is a state located in the East Central United States of America. As classified by the United States Census Bureau, Kentucky is a Southern state, more specifically in the East South Central region. Kentucky is one of four U.S. states constituted as a commonwealth...

 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 Green and Ohio

Ohio River

The Ohio River is the largest tributary, by volume, of the Mississippi River. At the confluence, the Ohio is even bigger than the Mississippi and, thus, is hydrologically the main stream of the whole river system, including the Allegheny River further upstream...

 rivers, 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...

.

The Pond River rises in central Todd County

Todd County, Kentucky

Todd County is a county located in the U.S. state of Kentucky. As of 2000, the population is 11,971. Its county seat is Elkton. The county is named after Colonel John Todd, who was killed at the Battle of Blue Licks in 1782...

 and flows generally north-northwestwardly, along the boundaries of Muhlenberg

Muhlenberg County, Kentucky

Muhlenberg County is a county located in the U.S. state of Kentucky. As of the 2010 Census, the population was 31,499. The county is named for Peter Muhlenberg. Its county seat is Greenville....

, Christian

Christian County, Kentucky

Christian County is a county located in the U.S. state of Kentucky. It was formed in 1797. As of 2000, its population was 72,265. Its county seat is Hopkinsville, Kentucky...

, Hopkins

Hopkins County, Kentucky

Hopkins County is a county located in the U.S. state of Kentucky. It was formed in 1807. As of 2000, the population was 46,519. Its county seat is Madisonville. The county is named for General Samuel Hopkins, an officer in both the Revolutionary War and War of 1812, and later a Kentucky legislator...

 and McLean

McLean County, Kentucky

McLean County is a county located in the U.S. state of Kentucky; its population was 9,938 in the 2000 Census. McLean County's county seat is at Calhoun....

 counties to the Green River, which it joins from the south about 5 miles (8 km) west-southwest of the town of Calhoun

Calhoun, Kentucky

Calhoun is a city in McLean County, Kentucky, United States. The population was 836 at the 2000 census. It is the county seat of McLean County. It is included in the Owensboro, Kentucky Metropolitan Statistical Area...

.

At the common boundary of Christian, Hopkins and Muhlenberg counties, it collects the 29.6 miles (47.6 km) West Fork Pond River. Upstream of this confluence, the Pond River has also been known as the East Fork Pond River.