Dauphin County, Pennsylvania in the context of "Harrisburg, Pennsylvania"

Carlisle is a borough in and the county seat of Cumberland County, Pennsylvania, United States. Carlisle is located within the Cumberland Valley, a highly productive agricultural region. As of the 2020 census, the borough population was 20,118; including suburbs in the neighboring townships, 37,695 live in the Carlisle urban cluster. Carlisle is the smaller principal city of the Harrisburg–Carlisle metropolitan statistical area, which includes Cumberland and Dauphin and Perry counties in South Central Pennsylvania.

The U.S. Army War College, located at Carlisle Barracks, prepares high-level military personnel and civilians for strategic leadership responsibilities. The Carlisle Barracks ranks among the oldest U.S. Army installations and the most senior military educational institution in the United States Army. Carlisle Barracks is home of the United States Army Heritage and Education Center, an archives and museum complex open to the public. Carlisle is also home to Penn State Dickinson School of Law and Dickinson College. Dickinson College is also noted as it was the first college or university chartered after the United States was founded.

The Lebanon Valley is a geographic region that lies between South Mountain and the Ridge and Valley Province of eastern Pennsylvania. The valley lies almost entirely within Lebanon and Berks counties in Pennsylvania. Portions of the valley lie in eastern Dauphin and northern Lancaster counties in Pennsylvania. It is bound to its southwest by the Susquehanna River and to its northeast by the adjoining Lehigh Valley.

The Lebanon Valley is part of the much longer Great Appalachian Valley, also called the Great Valley, a natural lowland route running northeast–southwest and lying just inland from the Blue Ridge Mountains and South Mountain. The Great Valley, including the Lebanon Valley, has historically been admired for its fertile agricultural land. Beyond the southwestern end of the Lebanon Valley, the Great Valley is known locally as the Cumberland Valley. To the northeast the Great Valley is known locally as the Lehigh Valley. Lebanon Valley College is named for the region. The western part of the valley lies within the Chesapeake Bay watershed. The eastern part lies within the Delaware River watershed.