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Koh Tao · boat

Sail Rock

Editorial plate — compiled from published sources, not yet confirmed by a verified diver. Dived here? Verify this plate.

Between Koh Tao and Koh Phangan

9.95000°N, 99.96000°E

A lone rock between Koh Tao and Koh Phangan with a vertical chimney swim-through and big schools of barracuda and trevally.

Depth
—
Vis
10–40 m

—

Current
mild
Health
Unscored

Awaiting verified ratings

Geo (surface approx.)
9.95000°N, 99.96000°E

Approximate position from published sources.

Entry / access
boat

The rock breaks the surface midway between the two islands and drops to sand around 40 m, with outlying pinnacles to the west and east. Its best-known feature is the Chimney, an enclosed vertical swim-through between about 18 m and the shallows. Water is usually calm, and whale sharks pass through in some seasons.

Difficulty
intermediate

Open Water; suits all levels in calm conditions

Best season
Mar–Apr noted for good visibility
Last reviewed
20 Oct 2026 by editorial

Hazards

  • low · Wind-driven waves and current offshore
  • low · Chimney swim-through (vertical, enclosed)

Marine life

Typical: whale shark, chevron barracuda, batfish, bigeye trevally, queenfish, honeycomb grouper, giant clam, black coral

Durable site rating

Multi-axis score

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Condition reports

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Living record

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Questions people search

Is Sail Rock suitable for beginners?

intermediate — Open Water; suits all levels in calm conditions

Sources

Where sources disagree

Black Turtle's own page is inconsistent on chimney entry/exit depths (18 m→6 m vs 5 m→18 m) and on rock height above water (8 m vs 10 m). Black Turtle says Open Water but 'suited to advanced'; SSI says all levels.

Listed by: Black Turtle Dive, Big Blue Diving

Related sites

Other intermediate plates in Koh Tao.

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