Ha Long Bay, Vietnam 下龙湾，越南
In Vietnam's Gulf of Tonkin, Ha Long Bay is dotted with more than 1,600 islands and limestone islets. Steep rocks and thick jungle have helped the islands avoid human impact -- many contain mysterious grottoes and caves, the result of 500 million years of formation and erosion.
下龙湾是位于越南东京的海湾，它被1,600多个小岛和石灰岩小岛装点。陡峭的岩石和茂密的丛林保护这些小岛免受人类的影响：很多小岛上有神秘的岩穴和洞穴。这些洞穴是同事50亿年冲刷腐蚀而形成的。