Shiprock-San Juan County, New Mexico, Navajo reservation.: Share the Beauty of the U.S. with the World... HOST A FOREIGN EXCHANGE STUDENT! For more information, contact OCEAN today! Toll-Free: 1-888-996-2326; E-mail: firstname.lastname@example.org; Web: www.ocean-intl.org
Natural Entrance, Carlsbad Caverns National Park, New Mexico Carlsbad Cavern includes a large cave chamber, the Big Room, a natural limestone chamber which is almost 4,000 feet (1,220 m) long, 625 feet (191 m) wide, and 255 feet (78 m) high at the highest point. It is the third largest chamber in North America and the seventh largest in the world.