The North Anna River is a principal 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 Pamunkey River

Pamunkey River

The Pamunkey River is a tributary of the York River, about long, in eastern Virginia in the United States. Via the York River it is part of the watershed of Chesapeake Bay.-Course:...

, about 62 miles (99.8 km) long, in central Virginia

Virginia

The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...

 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 Pamunkey and York

York River (Virginia)

The York River is a navigable estuary, approximately long, in eastern Virginia in the United States. It ranges in width from at its head to near its mouth on the west side of Chesapeake Bay. Its watershed drains an area including portions of 17 counties of the coastal plain of Virginia north...

 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 Chesapeake Bay

Chesapeake Bay

The Chesapeake Bay is the largest estuary in the United States. It lies off the Atlantic Ocean, surrounded by Maryland and Virginia. The Chesapeake Bay's drainage basin covers in the District of Columbia and parts of six states: New York, Pennsylvania, Delaware, Maryland, Virginia, and West...

. The river was the site of the Battle of North Anna

Battle of North Anna

The Battle of North Anna was fought May 23–26, 1864, as part of Union Lt. Gen. Ulysses S. Grant's Overland Campaign against Confederate Gen. Robert E. Lee's Army of Northern Virginia. It consisted of a series of small actions near the North Anna River in central Virginia, rather than a...

 during the American Civil War

American Civil War

The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

.

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...

, the river has also been known as "Northa-Anna" and as the main stem of the Pamunkey River.

Course

The North Anna River is formed by a confluence of smaller streams in western Orange County

Orange County, Virginia

As of the census of 2000, there were 25,881 people, 10,150 households, and 7,470 families residing in the county. The population density was 76 people per square mile . There were 11,354 housing units at an average density of 33 per square mile...

 and flows generally southeastwardly. The river's course is used to define all or portions of the southern boundaries of Orange, Spotsylvania

Spotsylvania County, Virginia

As of the census of 2000, there were 90,395 people, 31,308 households, and 24,639 families residing in the county. The population density was 226 people per square mile . There were 33,329 housing units at an average density of 83 per square mile...

 and Caroline

Caroline County, Virginia

Caroline County is a county located in the Commonwealth of Virginia. As of 2010, the population was 28,545. Its county seat is Bowling Green. Caroline County is also home to The Meadow stables, the birthplace of the renowned racehorse Secretariat, winner of the 1973 Kentucky Derby, Preakness and...

 counties; and the northern boundaries of Louisa

Louisa County, Virginia

Louisa County is a county located in the Commonwealth of Virginia. As of 2010, the population was 33,153. The county seat is Louisa.- History :...

 and Hanover

Hanover County, Virginia

As of the census of 2000, there were 86,320 people, 31,121 households, and 24,461 families residing in the county. The population density was 183 people per square mile . There were 32,196 housing units at an average density of 68 per square mile...

 counties. It joins the South Anna River

South Anna River

The South Anna River is a principal tributary of the Pamunkey River, about long, in central Virginia in the United States. Via the Pamunkey and York rivers, it is part of the watershed of Chesapeake Bay....

 to form the Pamunkey River on the common boundary of Caroline and Hanover counties, about 5 miles (8 km) northeast of the town of Ashland

Ashland, Virginia

Originally known as Slash Cottage, Ashland is located on the Old Washington Highway U.S. Route One and the Richmond, Fredericksburg and Potomac Railroad, a busy north-south route now owned by CSX Transportation...

.

The North Anna Dam on the common boundary of Louisa and Spotsylvania counties causes the river to form Lake Anna

Lake Anna

Lake Anna is one of the largest freshwater inland lakes in Virginia, covering an area of 13,000 acres , and located 72 miles south of Washington, D.C. in Louisa and Spotsylvania counties...

, which was created to provide water for the adjacent North Anna Nuclear Generating Station

North Anna Nuclear Generating Station

The North Anna Nuclear Generating Station is a nuclear power plant on a site in Louisa County, Virginia. The site is operated by Dominion Generation company and is jointly owned by the Dominion Virginia Power corporation and by the Old Dominion Electric Cooperative .The plant has two Westinghouse...

.

Near its mouth the North Anna River collects the Little River

Little River (North Anna River)

The Little River is a river in Louisa and Hanover counties in the U.S. state of Virginia. It is a tributary of the North Anna River, and via the North Anna, Pamunkey, and York rivers is part of the Chesapeake Bay watershed.-References:...

.