Rock Creek Park is a large urban park that bisects the Northwest quadrant of Washington, D.C. Created by Act of Congress in 1890, the park comprises 1,754 acres, generally along Rock Creek, a tributary of the Potomac River. More than two million people visit the park each year, many to use recreation facilities such as its golf course; hiking, biking, and equestrian trails; tennis center; nature center; playgrounds, and picnic facilities.