According to WhenOnEarth, Ha Long Bay features many tropical plants and animals, floating fishing villages, and unique formations of eroded limestone, including a multitude of small islands and huge caves.
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The UNESCO-recognised world heritage site is considered a popular coastal destination in northeastern Vietnam.
The 12 greatest coastlines include Lofoten Archipelago in Norway, Na Pali beach in Hawaii, Cape Town in South Africa, Algarve in Portugal, and Great Ocean in Australia.
