Legend has it that Halong Bay was created in the 13th century when the Mongols invaded Vietnam.  The King of Heaven sent  mother dragon and and a baby dragon to defend Vietnam.  The dragon spewed fire and jewels making a wall to keep the Asian hordes out of Halong Bay.  After defeating them the wall became the limestone in the more than 1900 islands from Haiphong to Quang Ninh Provence. This Unesco World Heritage site has been discovered but is a feast for the senses.  Junks ply the waters offering overnight gourmet dinner cruises and cave explorations. Halong Bay is the number one tourist destination in Northern Vietnam.