英文關鍵字
ancient
asia
asian
attraction
bang
cave
cavern
ceiling
countryside
destinations
dong
doong
formation
geological
geology
grotto
hoi
hole
karst
landmarks
limestone
nam
national
natural
nature
nha
paradise
park
phong
province
rock
scene
sedimentary
sightseeing
son
southeast
stalactite
stalactites
stalagmite
stalagmites
stone
tour
tourism
tourist
travel
underground
unesco
viet
vietnam
vietnamese