Halong Bay, one of the most stunning attractions in Vietnam and a UNESCO World Heritage Site, is both majestic and mystical, an incredible accomplishment of Mother Nature that never ceases to amaze. With thousands of calcareous islands, mountains, grottoes, and caves, Halong Bay has a very diversified natural terrain, ranging from extensive stretches of sandy beach to thousand-year-old limestone karsts such as Thien Cung, Dau Go, Sung Sot (Surprising), Trinh Nu (Virgin), Cat Ba Island, and others.