Dragon Hole
Sanya · China
Dragon Hole, also known as Sansha Yongle Blue Hole, is the deepest known blue hole in the world, plunging to over 300 meters. Located north of Drummond Island in the Paracel Islands, local fishermen refer to it as the 'eye' of the South China Sea. While its extreme depth is a geological wonder, diving activity typically explores its shallower, sunlit upper reaches.
Conditions
Depth
5 to 30 m
Open water and up
Current
Usually gentle
Can pick up on the edge
Visibility
15 to 25 m
Clearest in the calm season
Water
26 to 29°C
Tropical wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
| Vis (m) | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Current | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle |
Your chances of seeing each animal
Blacktip Reef Shark
Last confirmed May 10, 2026 · 130 records
Almost always
Nearly every dive
Whitetip Reef Shark
Expected
Known here, not yet in recent logs
Humphead Wrasse
Expected
Known here, not yet in recent logs
Giant Grouper
Expected
Known here, not yet in recent logs
Bumphead Parrotfish
Expected
Known here, not yet in recent logs
Moray Eel
Expected
Known here, not yet in recent logs
Gear