Shark Island
เกาะฉลาม
Current-Swept Action
A dramatic rocky island with strong currents that attract blacktip reef sharks, large barracuda, and pelagic visitors.
Depth Range
0–25m
Site Type
island reef
Koh Tao & Offshore
Visibility
8–25m
27–30°C
Getting There
15 min boat from Koh Tao
SE tip of Koh Tao
Marine Life
Notable Features
- • Blacktip reef shark territory
- • Strong current diving
- • Dramatic rocky topography
Best Time to Visit
About Shark Island
Shark Island (Koh Chalam) is a jagged rocky outcrop off Koh Tao's southeastern tip. Strong currents sweep nutrient-rich water past the island, attracting predators — blacktip reef sharks patrol the deeper slopes while titan triggerfish aggressively guard their nests on the reef flat. The challenging conditions keep crowds thin and reward confident divers with reliably exciting marine encounters.
Tips
Dive the lee side based on current direction. Titan triggerfish can be aggressive during nesting season (Mar–Jun].
Experience Required
Intermediate to advanced. Current experience essential.
Location
GPS: 10.0590°N, 99.8440°E