What to expect: Ha Long bay covers an area of 1,553 square kms with over 3000 limestone islands that rise from the clear, emerald water of the Gulf of Tonkin near the Chinese border. Ha long Bay is one of the natural marvels of Vietnam. Visiting beaautiful landscape of countyside on the way to Halong. Discovering wonderful limestone islands and beautiful and amazing cave, Do kayaking and swmmming.