el malpais national monument

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National monument, western New Mexico, U.S. Located at an elevation of 6,400-8,400 ft (1,950-2,560 m), it covers 114,716 acres (46,424 hectares), including a lava flow area of 85,000 acres (34,400 hectares). Features include a 17-mi (27-km) lava tube system, a number of ice caves, volcanic cinder cones, one of New Mexico's largest natural arches, and more than 20 gas and lava spatter cones. Designated a national natural landmark with the name Grants Lava Flow in 1969, it became a national monument in 1987
el malpais national monument
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