Green Rock

Green Rock is a cluster of granite boulders off the north-west tip of Koh Nang Yuan, cut by swim-throughs, small caverns and narrow passages from about 6 m down to 28 m. Blue-spotted stingrays rest on the sand patches, moray eels and groupers hide in the cracks and yellowtail barracuda hang above the rocks. It is best known for its titan and yellowmargin triggerfish, which defend nests aggressively in the breeding season. Sea snakes and good nudibranch hunting add to the maze-like dive.

Facts

• Region: Thailand – Koh Tao & Samui
• Area: Koh Nang Yuan
• Depth: 4–28 m
• Level: intermediate
• Current: moderate
• Type: reef, cave
• Coordinates: 10.1257, 99.8103
• Highlights: swim-throughs and caverns, titan triggerfish, yellowmargin triggerfish, blue-spotted stingray, sea snake, moray eel, grouper, yellowtail barracuda, nudibranchs
• Tips: Navigation through the boulders is tricky – stay close to your guide. In nesting season keep away from triggerfish territories and swim sideways, not up, if one charges.

Sources

• https://www.bigbluediving.com/koh-tao-dive-sites/green-rock/
• https://www.crystaldive.com/koh-tao-dive-site-guide-crystal-dive-koh-tao/
• https://dive-the-world.com/diving-sites-thailand-koh-tao.php
• https://thaiwreckdiver.com/gps_coordinatesx/