Sail Rock

Sail Rock stands alone in the middle of the gulf, a granite sail above water and a fish magnet below it, widely rated the best dive in the Gulf of Thailand. Its party trick is the Chimney, a vertical shaft through the rock that divers enter near 18 m and exit around 6, rising through a tube of stone with fish flickering past the openings. Outside, the monolith disappears under snapper, fusiliers, and big-eye trevally so dense they behave like weather, with queenfish and king mackerel raiding the edges and whale sharks calling unannounced. Batfish follow divers around like hired guides.

その瞬間のために: The Chimney swim-through, bait-ball density on a lone monolith, regular whale-shark cameos

地形: Granite monolith rising from around 30-34 m to above the surface

エントリー: Roughly midway toward Koh Phangan and dived by boats from Koh Tao, Phangan, and Samui; expect company.

危険生物・リスク: An overhead shaft with two-way traffic, mid-sea exposure, and busy surface conditions.

保全: Heavy multi-island boat traffic; moorings, not anchors, and patience at the Chimney entrances.

ナイトロックス: ここでは効果的です——このエリアのプロファイルは、ナイトロックスが無減圧潜水時間を有意に延ばせる水深帯にあります（適切なトレーニングを受けていることが前提です）。