In Vietnamese, “halong” means “descending dragon.” Legend has it that Halong Bay was formed thousands of years ago by dragons who came down from the heavens to protect local inhabitants from invaders. The Dragon Mother and her children spat giant emeralds into the sea battlefield, which created a defensive barricade against the invaders. The emeralds eventually turned into the islands and islets that majestically dot the ocean landscape off the northern Vietnam coast.