13. GrutadoLago Azul 藍湖洞

The "Blue Lake Grotto" is part of one of the world's largest flooded cavities. Its blue waters extend more than 200 feet deep. The mysterious source of the lake is believed to be an underground river that has yet to be located. The grotto is rich with prehistoric treasures. A Franco-Brazilian expedition in 1992 uncovered thousands of prehistoric animal bones, including saber-tooth tigers and giant sloths.
“藍湖洞”是世界上最大洪水洞的一部分。它藍色的湖水延伸到200多英尺深。據說，湖水的神秘源頭是還未確定明確方位的地下河。石窟中藏有豐富的史前寶藏。1992年，一支法國和巴西的聯合探險隊在這發現了成千上萬副包括劍齒虎和大樹獺在內的動物骨骼。