Ha Long Bay or Bay of the Descending Dragon is popular with both Vietnamese and international tourists.One of the attractions of Ha Long Bay is the Bay's calm water and the thousands od limestone mountains.The Bay's water is clear during the spring and early summer.Upon arriving in Ha Long Bay City,visitors can go along''Bai Chay''or Scorched Beach.From the beach,they can hire a boat and go out to the Bay.It is hear that visitors can find some of Sourched Asia's most fascinating sites.Dau Go cave is one of the most beautiful caves at Ha Long Bay.It was the cave in which Genearal Tran Hung Dao hid wooden stakes to beat the Mongols on Bach Dang River in 1288