Berkeley Heights is a township in northwestern Union County within the wooded ridges and valleys of the Watchung Mountains. Interstate 78 crosses the municipality, providing access toward Newark, New York City, Somerset County, and western New Jersey. The Berkeley Heights NJ Transit station on the Gladstone Branch connects the community with Summit, Newark, Hoboken, and New York connections. Springfield Avenue and local roads link residential neighborhoods with schools, parks, shops, offices, and neighboring New Providence, Summit, Warren, Watchung, and Long Hill. The township contains established suburban neighborhoods, corporate and research properties, community institutions, and significant wooded open space. Portions of the Watchung Reservation lie nearby, reinforcing the area's green and hilly character. Berkeley Heights developed from several smaller settlements into a modern commuter community while retaining historic sites and older road patterns. Its rail service, highway access, and elevated landscape give it a distinct position along the Union-Somerset county line.