Halong Bay Cruising Tours
This is an enclosed group of islands. It connects with the sea via a 4-meter-wide, 100-meter-long, and 3-meter-high mouth. Inside the grotto, the 1-km2 brackish lake is surrounded by mountains. On the cliff one still find traces of fossils of fresh-water snails, which prove that men used to live there and this must have been a deep valley then.
The beauty of the site, is the mingling of a number of factors: the mountain's size and form, the colour of the water and the clouds.
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