Valles Caldera National Preserve
89,000-acre region, formerly the Baca Ranch, nestled inside a volcanic caldera in the Jemez Mountains. Includes sections on visitors' activities, ranching, and ongoing scientific research.
www.vallescaldera.gov
Little River Canyon National Preserve
Features the nation's longest mountaintop river and one of the southeast's deepest canyons. Headquarters in Fort Payne, AL.
www.nps.gov/liri
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