Taiwan · off Kaiyuan Harbor, Lanyu
Blue Hole
Also known as: Lan Dong, Kaiyuan Harbor Blue Grotto
Best time to dive
January to December
Certification & difficulty
Open Water
Snorkelling
Not a snorkel site - limited - surface/entrance area only; interior tunnel/cavern is a dive-only overhead environment
Safety notes
overhead/cavern environment with three entrances forming a T-junction (disorientation risk), approx 30m-long tunnel requiring roughly 60 seconds of traverse, outward current that can sweep divers offshore, boat traffic near the harbor mouth
Permits & fees
no specific government dive permit/fee identified beyond standard Lanyu dive-trip package costs
Permits and operators change - confirm before booking.
Location
Nearest hub: Lanyu
This profile is desk research, compiled from public sources - not a first-hand dive report. Coordinates are approximate.