![](http://www.alamy.com/thumbs/6/EEE36419-D791-4BD1-889F-785FDEC13EDF/KAF5NN.jpg)
Tourist boats, the mouth of Phong Nha cave with underground river, Phong Nha-Ke Bang National Park, Vietnam
Size: 6000px × 4000px
Photo credit: © Huu Dai Trinh / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: asia, bang, binh, boat, cave, formation, geological, geology, grotto, heritage, karst, limestone, national, nha, nha-ke, park, phong, quang, river, rock, site, son, southeast, stone, underground, unesco, vietnam, world