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The Valles Caldera. Valles Caldera Is A 13.7-Mile Wide Volcanic Caldera In The Jemez Mountains Of Northern New Mexico. Hot Springs, Streams, Fumaroles, Natural Gas Seeps And Volcanic Domes Dot The Caldera Floor Landscape. The Highest Point In The Caldera Is Redondo Peak, An 11,253-Foot Lava Dome Located Entirely Within The Caldera.