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

transportation outdoors day daytime vessels boat marine coast asia landscapes tourism island walkway boats paths limestone world heritage site tourist attractions walkways southeast asia vietnam halong causeway vietnamese outside nobody travel landscape path color image unesco water tourist attraction travel destination travel destinations unesco world heritage site non urban scene isle karst causeways no one no people isles ha long bay indochina karsts quang ninh sung sot cave