Rock Climbing · Cat Ba Island, Hai PhongDeep-water solo climbing, Cat Ba & Ha Long BayEXPERTRisk: HIGHVND Guided DWS day trip ~1,…Limestone karst towers rising straight out of the bay's emerald water, climbed ropeless with the sea itself as the landing zone — reached only by boat, with hundreds of largely unclimbed formations still waiting for first ascents.View details