The Plain is the parade field at the United States Military Academy at West Point, New York. The flat terrain of the Plain is in contrast to the varied and hilly terrain of the remainder of the campus. The Plain rises approximately 150 feet (45 m) above the Hudson River and has been the site of the longest continually occupied U.S. Army garrison in America since 1778. In its early years, the entire academy was located on the Plain and it was used for varying activities ranging from drill and mounted cavalry maneuvers to an encampment site for summer training to a sports venue. Currently, the Plain refers to just the parade field where cadets perform ceremonial parades.