By: Mel Longhurst
Ref: MG9843
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INTERIOR • of • CAVE • stone • below • TRIP • under • long • ground • island • holiday • INSIDE • PEOPLE • LEISURE • Group • vertical • TOUR • beneath • NAM • ROCKY • ROCKS • ROCK • TRAVEL • lime • limestone • bay • VACATION • GO • TOURIST • ATTRACTION • ASIA • VIET • Asian • celestial • Palace • HOLIDAYS • VACATIONS • TOURISTS • visiting • TOURISM • VIETNAM • TIEN • Vietnamese • travelling • Indochina • HALONG • THIEN • DONG • CUNG • DAU • CAVES • underground • formation • RECREATION • visitors • Geology • Geological • Journey • Travels • Caving • Calcite • Cavern • Formations • Subterranean • GROTTOES • grotto • sightseeing • HANG • grottos • Destination • Traveling • Explore • Visit • Sightseers • HA • Thiencung • Cavernous • MG9843 •