National Natural Landmarks
The Valles Caldera is a large circular depression, 12 to 15 miles in diameter, with scalloped walls rising from a few hundred to more than 2,000 feet above the present floor. Located primarily within the Valles Caldera National Preserve, the site is one of the largest calderas in the world and is an excellent example of a caldera advanced in history but still retaining the essential structures.
Year designated: 1975
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Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.