Board Hai Au Aviation's spectacular seaplane for a flightseeing journey high above Vietnam's UNESCO World Heritage Site, Ha Long Bay. Ha Long Bay is a magnificent archipelago of 1,969 limestone pillars and islets, covering 772 square miles. Thousands of limestone karsts and isles rise out of the sea, in a stunning geological display. Soar high above the opal sea and Ha Long Bay's breathtaking pillars in a seaplane, a once-in-a-lifetime experience. Your flight will take you 500 to 900-feet above Ha Long Bay, offering you stunning views of this natural marvel. See Ha Long Bay as few get to experience it from the air. Marvel at limestone pillars rising up out of turquoise waters, while discovering the region's rich natural history.