Koh Haa

Tucked between Koh Lanta and the open Andaman Sea, Koh Haa (meaning “Five Islands” in Thai) is a stunning and diverse dive destination that belongs high on every Thailand liveaboard diving itinerary. Known for its aquarium-like visibility, cathedral caverns, and protected lagoon, Koh Haa offers a dream dive environment for underwater explorers of all levels.

The site features a series of five limestone islets (plus a few more hidden pinnacles) that form a natural lagoon and a variety of underwater environments—making it perfect for multi-dive days. Whether you're gliding over coral gardens, exploring underwater caves, or scanning the blue for pelagics, Koh Haa delivers.

Top dive highlights include:

• The Lagoon – A protected, shallow site ideal for relaxed diving, snorkelers, and training, with schools of reef fish, clownfish, and moray eels in abundance.

• The Cathedral – One of Koh Haa’s most famous dive spots, this double-chamber cavern dive features dramatic light play and an ethereal underwater atmosphere, ideal for wide-angle and ambient light photography.

• Koh Haa Yai Wall – A wall and slope dive teeming with soft corals, sea fans, and macro life like nudibranchs, pipefish, and squat lobsters.

• Pelagic Sightings – Keep your eyes on the blue for trevally, tuna, barracuda, and the occasional manta ray or whale shark during peak season.

While Koh Haa is often calm, some outer sites offer mild to moderate currents, adding a dynamic edge to the experience and great conditions for drift dives.

Only accessible by boat, Koh Haa is an ideal destination for Thailand liveaboard diving, combining dramatic topography with serene conditions. With DiveRACE liveaboard, you’ll be able to explore the full range of Koh Haa’s diverse sites in comfort and style, guided by experts who know how to time dives for the best light, conditions, and sightings.

Looking for the perfect mix of scenic beauty, marine diversity, and calm diving? Koh Haa is your underwater paradise. Join DiveRACE liveaboard and discover why this site is one of Thailand’s best-kept diving secrets. Book your trip today!