Berks County, Pennsylvania in the context of "Northumberland County, Pennsylvania"

Reading (/ˈrɛdɪŋ/ RED-ing; Pennsylvania German: Reddin) is a city in Berks County, Pennsylvania, United States, and its county seat. The city had a population of 95,112 at the 2020 census and is the fourth-most populous city in Pennsylvania after Philadelphia, Pittsburgh, and Allentown. Reading is located in the southeastern part of the state and is the principal city of the Greater Reading area, which had 420,152 residents in 2020.

Reading gives its name to the now-defunct Reading Company, also known as the Reading Railroad and since acquired by Conrail, that played a vital role in transporting anthracite coal from Pennsylvania's Coal Region to major East Coast markets through the Port of Philadelphia for much of the 19th and 20th centuries. Reading Railroad is one of the four railroad properties in the classic U.S. version of the Monopoly board game. Reading was one of the first localities where outlet shopping became a tourist industry. It has been known as "The Pretzel City" because numerous local pretzel bakeries are based in the city and its suburbs; currently, Bachman, Dieffenbach, Tom Sturgis, and Unique Pretzel bakeries call the Reading area home. In recent years, the Reading area has become a destination for cyclists with more than 125 miles (201 km) of trails in five major preserves; the region is an International Mountain Bicycling Association ride center.

South Mountain is a colloquial name applied to an Appalachian Mountain range extending north and northeast along the south side of Lebanon Valley to the Lehigh Valley region of eastern Pennsylvania. South Mountain includes the southernmost cluster of peaks that straddle Berks, Lancaster, and Lebanon counties and the northernmost end of the ridge on which Lehigh University is built, in Bethlehem in the Lehigh Valley.

The mountain borders Emmaus just south of Allentown and comprises a ridge of low mountains passing east of Reading, and then extends due west. South Mountain is a continuation of the New England Province and is the southern end of the Hudson Highlands. The mountain is a core geographic feature throughout much of the Pennsylvania side of the Lehigh Valley. The mountain is called the Reading Prong by geologists.

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.