Koh Larn Vak

Chon Buri, Thailand

Depth

12m

Visibility

5m - 15m

Entry

Boat

Experience Level

Experienced

Koh Larn Vak

Chon Buri, Thailand

Depth

12m

Visibility

5m - 15m

Entry

Boat

Experience Level

Experienced

About Koh Larn Vak

Koh Larn, meaning "Coral Island", a mostly mountainous tropical island and the largest of the near islands at 2km wide by 4km long, is located about 7km off the coast of Pattaya. It has six beaches and a population of around 1000, mostly centred around the main village of Naban. Koh Larn Vak's distinguishing feature is its underwater restaurant, albeit not intended. Questionable engineering resulted in part of the restaurant sinking before completion. Other notable features of this site are the vertical concrete tubes teeming with coral and number of small caves. Good for practising buoyancy skills. Stationary seahorses can be found at 9m. A safety balloon is recommended when ascending due to a nearby jet-ski station.

Koh Larn Vak Dive Info

Terrain & Features

Reef, Drift, Cave

Entry Type

Boat

Max Depth

12m

Visibility Range

5m – 15m

Experience Level

Experienced

Best Gas Mix

21%

O₂

CNS Load (45 min)

8% at 10m / 36%

O₂

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Marine Life

Corals
Cuttlefish
Rays
Turtles

Weather Conditions

Water Temperature ℃

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Location

Dive Site Hazards

Hidden Depth Variations — Complex reef topography can conceal depth changes, leading to unintended profile variations.
Distraction from Marine Activity — High fish activity can distract divers and delay depth or gas awareness.
Rapid Surge Direction Changes — Surge near reef structures can reverse direction quickly, pushing divers sideways into unexpected areas.

Eddy Pull-Off Zones — Eddies behind structures can pull divers away from the main drift line.

Delayed Surface Pickup — Strong current can exceed surface tracking assumptions, delaying boat pickup.

Vertical Current Shear — Currents may vary by depth, causing vertical separation even when divers stay together.

Remote Silt Disturbance — Silt can be disturbed metres away from the source.

Rapid Stress Escalation — Stress can increase sharply when visibility or navigation degrades.

High Cognitive Load Navigation — Complex passages increase mental workload even on a line.

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