Koh Ha
Koh Ha is a small group of five islands 25km west of Koh Lanta, separated by channels over 50m deep. The water here is ordinarily quite clear and visibility frequently exceeds 25 metres.
The highlight of diving here is a series of caves, or caverns on the largest of the islands, Koh Ha Yai. The emerald light filtering through the cave entrance at sunrise is quite magical. The caves are safe to enter, even without a light, as the entrances to the first caves are large. You can surface inside the caves and see stalactites hanging down from the ceiling above.
If you enjoy swim-throughs then try the one on the wall slightly to the right of the main (right-hand) entrance. Swim through the tiny entrance, then vertically downwards. Make a sharp left, and squeeze out the exit point. Hey presto, you're back in the main cave chamber!
Please beware that cave diving requires special training beyond the scope of recreational diving. Penetration into the passageway at the rear of the main chamber is dangerous and is not recommended.
Koh Ha is often visited by Phuket liveaboards on trips to Hin Daeng.
Koh Ha Reef Basics: Caverns and boulders
Depth: 10 - 35m
Visibility: 15 - 30m
Currents: Calm
Surface Conditions: Can be choppy
Water Temperature: 27 - 30°C
Experience Level: Intermediate
Diving Season: November to April
PADI Course Compatibility: Great for Cavern Diving and Underwater Photography
Distance: ~80 km southeast of Phuket
Access: Phuket Liveaboards; Phuket scuba diving day trip
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