Torca del Carlista (English: Carlista Cavern) is a large limestone cavern found in Cantabria, Spain, approximately 35 kilometres (22 mi) from the city of Bilbao.[1] The entrance, up the slopes of the Cantabrian Mountains, is only a single metre (3 feet) wide. The entry passage descends some 45 metres (148 ft) vertically in a narrow chimney before opening up into the cavern's main gallery.[1] Some 520 metres (1,710 ft) long and 245 metres (804 ft) wide, the total surface area of the cavern exceeds 20 acres, or 76,620 square metres (824,700 sq ft).[1][2] The main chamber is the fifth-largest underground chamber in the world, with a ceiling that reaches 120 metres (390 ft) at its highest point.[3][1]
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