The Northern Neck is the northernmost of three peninsula

Peninsula

A peninsula is a piece of land that is bordered by water on three sides but connected to mainland. In many Germanic and Celtic languages and also in Baltic, Slavic and Hungarian, peninsulas are called "half-islands"....

s (traditionally called "necks" in Virginia) on the western shore of the 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...

 in the Commonwealth of Virginia. This peninsula is bounded by the Potomac River

Potomac River

The Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States. The river is approximately long, with a drainage area of about 14,700 square miles...

 on the north and the Rappahannock River

Rappahannock River

The Rappahannock River is a river in eastern Virginia, in the United States, approximately in length. It traverses the entire northern part of the state, from the Blue Ridge Mountains in the west, across the Piedmont, to the Chesapeake Bay, south of the Potomac River.An important river in American...

 on the south. It encompasses the following Virginia counties: Lancaster

Lancaster County, Virginia

As of the census of 2000, there were 11,567 people, 5,004 households, and 3,412 families residing in the county. The population density was 87 people per square mile . There were 6,498 housing units at an average density of 49 per square mile...

, Northumberland

Northumberland County, Virginia

Northumberland County is a county located on the Northern Neck in the Commonwealth of Virginia, a state in the United States. In 2010, its population was 12,330. Its county seat is Heathsville...

, Richmond

Richmond County, Virginia

Richmond County is a county located on the Northern Neck in the Commonwealth of Virginia, a state in the United States. As of 2010, the population was 9,254. Its county seat is Warsaw. The rural county should not be confused with the large city and state capital Richmond, Virginia, which is over...

, and Westmoreland

Westmoreland County, Virginia

As of the census of 2000, there were 16,718 people, 6,846 households, and 4,689 families residing in the county. The population density was . There were 9,286 housing units at an average density of...

. The inclusion of King George

King George County, Virginia

As of the census of 2010, there were 23,584 people, 9,411 households, and 4,525 families residing in the county. The population density was 93 people per square mile . There were 6,820 housing units at an average density of 38 per square mile...

 in the Northern Neck varies among commentators. Historically the grant for the Northern Neck included all land between the Rappahannock and Potomac rivers including far upstream of King George.