Legend has it that the dragon that rose from the Red River, creating civilisation at Hanoi plunged into the sea at Halong, creating the estimated 1,900 towering limestone islands of Halong Bay. Declared a World Heritage Site by UNESCO in 1994, Halong Bay's karst islands rise up out of emerald waters covered in vegetation. Only a few are habitable; many have been sculpted into strange shapes by the wind and weather. Whilst here discover hidden beaches, caves, and lagoons. The best way to appreciate the bay is to take an overnight cruise, stopping along the route to visit fishing villages, explore grottoes, swim, and kayak.