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下龙湾 海蚀岩溶地貌奇观
下龙湾的石灰岩经历了5亿年的形成，海湾的岩溶演化历时2000万年。环境和地理多样性创造了生物多样性，是14种特有植物和60种特有动物的家园。海洋入侵使下龙湾与众不同，在世界上独一无二
天眼看世界实景143/472
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