Sung Sot Cave, Ha Long Bay, Quang Ninh, Vietnam

transportation outdoors day daytime vessels boat vessel coast asia cave landscapes scenics grotto cavern boats nautical boating limestone ships caves watercraft caverns world heritage site southeast asia vietnam halong vietnamese outside nobody scenic travel landscape ocean color image unesco water unesco world heritage site non urban scene nautical vessel isle karst grottoes no one no people isles ha long bay indochina karsts quang ninh sung sot cave