Located in northeastern Alabama, Russell Cave National Monument is one of the longest cave systems in Alabama at 7.2 miles (11.6km) long. Used as a shelter by prehistoric Native Americans, the cave is about 12,000 years old and contains a natural spring that eventually joins up with the Tennessee River. Russell Cave itself is roughly 210 feet (64m) long, 107 feet (33m) wide, and 26 feet (8m) high. The cave shelter is located approximately 300 yards (300m) from the visitor center and is accessable via an elevated wooden boardwalk. Guided tours of the cave shelter are conducted by National Park Service Interpretative Rangers. The cave shelter includes the areas that were occupied by the prehistoric groups and features a diorama depicting activities of the occupants.