 The borough was named for its location along the Hackensack River.According to the United States Census Bureau, River Edge borough had a total area of 1.895 square miles (4.909 km2), including 1.854 square miles (4.802 km2) of land and 0.041 square miles (0.107 km2) of water (2.18%).A suburb of New York City, River Edge is located approximately west of Upper Manhattan.