Hagerstown Valley is located in Maryland

Maryland

Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

 in the United States

United States

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

. It is part of the Great Appalachian Valley

Great Appalachian Valley

The Great Valley, also called the Great Appalachian Valley or Great Valley Region, is one of the major landform features of eastern North America. It is a gigantic trough — a chain of valley lowlands — and the central feature of the Appalachian Mountain system...

, which continues northward as Cumberland Valley

Cumberland Valley

The Cumberland Valley is a constituent valley of the Great Appalachian Valley and a North American agricultural region within the Atlantic Seaboard watershed in Pennsylvania and Maryland....

 in Pennsylvania

Pennsylvania

The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...

, and southward as Shenandoah Valley

Shenandoah Valley

The Shenandoah Valley is both a geographic valley and cultural region of western Virginia and West Virginia in the United States. The valley is bounded to the east by the Blue Ridge Mountains, to the west by the eastern front of the Ridge-and-Valley Appalachians , to the north by the Potomac River...

 in West Virginia

West Virginia

West Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...

 and 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...

.

Hagerstown Valley is bounded on the east by South Mountain

South Mountain (Maryland and Pennsylvania)

South Mountain is the northern extension of the Blue Ridge Mountain range in Maryland and Pennsylvania. From the Potomac River near Knoxville, Maryland in the south, to Dillsburg, Pennsylvania in the north, the long range separates the Hagerstown and Cumberland valleys from the Piedmont regions of...

, part of the Blue Ridge Mountains

Blue Ridge Mountains

The Blue Ridge Mountains are a physiographic province of the larger Appalachian Mountains range. This province consists of northern and southern physiographic regions, which divide near the Roanoke River gap. The mountain range is located in the eastern United States, starting at its southern-most...

. On the west the valley is bounded by the Bear Pond Mountains

Bear Pond Mountains

The Bear Pond Mountains are a sub-range in the Appalachian Mountains, that straddle Pennsylvania and Maryland in the United States. These mountains are a part of the Ridge and Valley Appalachians and reach their highest point at Cross Mountain . A unique geologic feature known as the "Punchbowl"...

 — a range of mountains linking Blue Mountain

Blue Mountain (Pennsylvania)

Blue Mountain is a ridge that forms the eastern edge of the Appalachian mountain range in the U.S. state of Pennsylvania. It cuts across the eastern half of the state from New Jersey to Maryland, providing a distinct boundary between a number of Pennsylvania's geographical and cultural regions...

 and North Mountain

North Mountain (Virginia-West Virginia)

North Mountain is a mountain ridge within the Ridge-and-valley Appalachians in the U.S. states of Virginia and West Virginia.-Geography:North Mountain spans from the Potomac River in the north to the community of Green Spring in Frederick County, Virginia in the south. The ridge is divided into...

.

The valley is bounded on the south 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...

 and on the north by the water divide

Water divide

A drainage divide, water divide, divide or watershed is the line separating neighbouring drainage basins...

 between Conococheague Creek

Conococheague Creek

Conococheague Creek, a tributary of the Potomac River, is a free-flowing stream that originates in Pennsylvania and empties into the Potomac River near Williamsport, Maryland. It is in length, with in Pennsylvania and in Maryland...

, which flows south to the Potomac River, and Conodoguinet Creek

Conodoguinet Creek

Conodoguinet Creek is a tributary of the Susquehanna River in south central Pennsylvania in the United States. The name is Native American, and means "A Long Way with Many Bends".Conodoguinet Creek joins the Susquehanna River upstream of Harrisburg....

, which flows northeast to the Susquehanna River

Susquehanna River

The Susquehanna River is a river located in the northeastern United States. At long, it is the longest river on the American east coast that drains into the Atlantic Ocean, and with its watershed it is the 16th largest river in the United States, and the longest river in the continental United...

. Sometimes the boundary between Hagerstown Valley and Cumberland Valley is defined politically, as the state line between Maryland and Pennsylvania.

The political definition restricts Hagerstown Valley to Washington County, Maryland

Washington County, Maryland

Washington County is a county located in the western part of the U.S. state of Maryland, bordering southern Pennsylvania to the north, northern Virginia to the south, and the Eastern Panhandle of West Virginia to the south and west. As of the 2010 Census, its population is 147,430...

, while the larger definition includes part of Franklin County, Pennsylvania

Franklin County, Pennsylvania

As of the census of 2000, there were 129,313 people, 50,633 households, and 36,405 families residing in the county. The population density was 168 people per square mile . There were 53,803 housing units at an average density of 70 per square mile...

 as well. Sometimes Cumberland Valley is defined so as to include Hagerstown Valley entirely, extending south all the way to the Potomac River.

Antietam Creek

Antietam Creek

Antietam Creek is a tributary of the Potomac River located in south central Pennsylvania and western Maryland in the United States, a region known as the Hagerstown Valley...

 flows through Hagerstown Valley to the Potomac River. Antietam National Battlefield

Antietam National Battlefield

Antietam National Battlefield is a National Park Service protected area along Antietam Creek in Sharpsburg, Maryland which commemorates the American Civil War Battle of Antietam that occurred on September 17, 1862...

 is also in the valley, where the Battle of Antietam

Battle of Antietam

The Battle of Antietam , fought on September 17, 1862, near Sharpsburg, Maryland, and Antietam Creek, as part of the Maryland Campaign, was the first major battle in the American Civil War to take place on Northern soil. It was the bloodiest single-day battle in American history, with about 23,000...

 was fought 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...

.

The main cities are Hagerstown, Maryland

Hagerstown, Maryland

Hagerstown is a city in northwestern Maryland, United States. It is the county seat of Washington County, and, by many definitions, the largest city in a region known as Western Maryland. The population of Hagerstown city proper at the 2010 census was 39,662, and the population of the...

 and Waynesboro, Pennsylvania

Waynesboro, Pennsylvania

Waynesboro is a borough in Franklin County, Pennsylvania, located northwest of Baltimore, Maryland, 67 miles southwest of Harrisburg, Pennsylvania, and north of the Mason-Dixon Line. The population within the borough limits was 9,614 at the 2000 census. When combined with the surrounding...

. The water divide between Hagerstown and Cumberland valleys occurs near the city of Chambersburg, Pennsylvania

Chambersburg, Pennsylvania

Chambersburg is a borough in the South Central region of Pennsylvania, United States. It is miles north of Maryland and the Mason-Dixon line and southwest of Harrisburg in the Cumberland Valley, which is part of the Great Appalachian Valley. Chambersburg is the county seat of Franklin County...

.