Dragon Hole
Blue hole
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Dragon Hole, also known as Yongle Blue Hole named after the third Ming emperor, is the deepest known blue hole in the world at 300.89 metres deep. It is located about 9 kilometres north of Drummond Island in the Paracel Islands. Wikipedia
Coordinates: 16°31′30″N 111°46′04″E / 16.5249°N 111.7679°E N16.5249373, E111.7680205 (N16°31.55’. E111°46.1’)
Location: Paracel Islands
Depth: 300.89 metres