双河洞国家地质公园,2019年最新探测长度为257.4公里,成为亚洲第一、世界第五长洞。双河洞结构复杂,水洞、旱洞并存,深度超过550米,由上中下四层8条主洞,200多条支洞,5条地下河,34个洞口组成,可谓洞挨洞、洞连洞、洞上有洞、洞下有洞、洞中套洞,被誉为“喀斯特天然洞穴博物馆”。 双河洞导游词是这么说:无限风光在险峰,探秘未知入洞中。[呲牙](文字摘自百度)
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