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Vietnam grotto contains a system of grottoes and caves, mainly located in the north. Until 2000, only 200 grottoes had been discovered, with 90% being short and medium length. In 2003, more than 300 grottoes were discovered, with many over 1000m in length in the West North. Until 2010, Quang Binh has discovered 300 grottoes in Phong Nha-Ke Bang, Ninh Binh with over 100 grottoes in Trang An. This increases the number of grottoes to 1000.
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