pier surrounded by limestone karst of ha long bay in quang ninh province, northeast vietnam

aqua asia bay beautiful blue boat bush cliff coast cruise destination dock east famous geographical geological geomorphological gondola green ha halong halongbay heritage island karst landmark landscape lime limestone long natural nature ninh north northeast ocean pier plant popular port province quang rock rocky scene scenery scenic sea seascape ship shore sightseeing site sky stone topography tour tourism travel tree unesco vacation vietnam view water world