Recognized by UNESCO as a world heritage site for its values of landscape, geology and geomorphology in 1994 and 2000, Ha Long Bay, located in Quang Ninh province, is a wonderful and skillful masterpiece of nature. The Bay features thousands of limestone islands in various sizes and shapes. Inside these stone islands are magnificent caves associated with many legendaries. Ha Long Bay contains important vestiges during development and formation of the Earth history. The site has a tectonic age of 250-280 million years.