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Colossal Cave is a cave system in southeastern Arizona, United States, near the community of Vail, about 22 miles (35 km) southeast of Tucson. It contains about 3.9 miles (6.3 km) of mapped passageways. Temperatures inside average 70 °F (21 °C) year-round. Previous names include 'Mountain Springs Cave' and 'Five–Mile Cave'.
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