In Ha Long Bay with 1,969 limestone islands rise from the surface of the sea islands. On the top of each island has a tree-based massively. Many of the islands are large cave inside. Caves, the largest cave in the Bay Area is a pole (Hang Đầu Gỗ), formerly known as. "A rock Wayne de Mer" (Grotte des Merveilles), named by French tourists who visit the bay at the end of the 19th century.
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