Dive-site story
Firestone Island, known locally as Fo Shek Chau, features dramatic volcanic columnar basalt that plunges below the surface into rocky slopes, gullies, and scattered boulder fields. Situated in the outer Ung Kong Group of Sai Kung, this exposed marine site offers healthier coral coverage than inshore bays, with macro life sheltering in rock crevices and sandy pockets between reefs.
Submerged volcanic basalt formations with steep rocky gullies and drop-offs
Diverse macro critters, including various sea slugs and cryptic crustaceans tucked in rock fissures
Patches of hard corals and soft gorgonian sea fans along the deeper slopes
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Summer and early autumn deliver the warmest water and most reliable underwater visibility before winter monsoons arrive.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clark's AnemonefishAmphiprion clarkii | Common | ||||||||||||
| Broadclub CuttlefishSepia latimanus | Seasonal | ||||||||||||
| Blackfin DartfishPtereleotris evides | Seasonal | ||||||||||||
| Chromodoris NudibranchChromodoris sinensis | Common | ||||||||||||
| ScorpionfishScorpaenopsis venosa | Common |
Marine forecast
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