2 caverns · down to 40 m · 2 suitable for an intro team
Cave diving in Koh Haa
- Caverns2
- Max depth40 m
- Water temperature29–30 °C
- Dive centres1
Diving and fills
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Why come here
Koh Haa is a cluster of islets in the Andaman Sea, ~25 km west of Ko Lanta, with caverns you dive in warm, clear water from a day boat. In the Cathedral of Koh Haa Yai you can surface under stalactites, and in the Chimney of Koh Haa Neua you rise through a shaft full of cave sweepers towards the light. Daylight is always in reach and you dive with a guide from a dive centre; for the narrower first cave of Koh Haa Yai you need cavern training. Plan around the season: Koh Haa is closed from 15 May to 15 October.
Don't miss
- Koh Haa Yai caves (The Cathedral): the light from the entrance below you makes the rock formations glow, and in one of the chambers you can surface under ancient stalactites hanging from the ceiling.
- The Chimney (Koh Haa Neua): a chamber packed with bronze cave sweepers, and from there you rise through the chimney towards the light.
On a rest day
- Old Town (Ko Lanta): The island's administrative centre on the east coast, home to most of Ko Lanta's Chao Ley, the 'sea people'.
- West-coast beaches: Klong Dao, Pra-Ae (Long Beach) and Klong Khong, the main beaches of Ko Lanta Yai; those in the south are harder to reach.
- Mu Ko Lanta National Park: The national park of 1990, covering part of Ko Lanta Yai and islands such as Ko Rok.
All 2 caverns
| Site | Max depth | Type | Certification |
|---|---|---|---|
| Koh Haa Yai caves (The Cathedral)Entry or dive feeBackmount · Cavern | 40 m | Backmount | Cavern |
| The Chimney (Koh Haa Neua)Entry or dive feeBackmount · Open water / no overhead | 35 m | Backmount | Open water / no overhead |
Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training.
Map
Dive centres and fill stations
1 dive centres, fill stations and instructors
Phoenix Divers (Ko Lanta)
Moo 1 154/1 Saladan, Ko Lanta 81150
Training: PADI
Guided dives: Koh Haa Yai caves (The Cathedral), The Chimney (Koh Haa Neua)
PADI dive centre (IDC) in Saladan with day trips to Koh Haa (three dives, two also possible), from mid-October to mid-May. Runs PADI courses up to instructor, including the Nitrox specialty, and freediving.
Order: partners first, clearly marked as partner; then dive centres by distance from Ko Lanta (Saladan) and independent instructors by name. Not a recommendation: check what they offer yourself.
On this list, or should you be? Get a free partner card →Where to stay
Find a place near Ko Lanta (Saladan)
Villages that work well as a base for the caves in this region. Find a place for your team:
- Ko Lanta (Saladan)Booking.com ↗
The links to Booking.com are affiliate links: if you book through one, DiveTripPlanner earns a small commission. You pay the same.
Practical info: rules, fills and emergency numbers
Emergencies
- Chamber at Bangkok Hospital Siriroj in Phuket, 24/7 for emergencies: 081-0819000 (otherwise 076-209-347). DAN: +1 919 684 9111.
Closed or restricted
- Season: Koh Haa is closed from 15 May to 15 October (Phoenix Divers, 2026); the dive season runs from November to April. Outside the season the wind brings rain and waves.
Fees and opening hours
- Costs: Koh Haa lies in a national park; Phoenix Divers charges a park fee of THB 600 per diver on every trip (THB 300 for children aged 3–14, THB 400 for non-divers; undated price list). A day trip with three dives costs THB 4,800 at Phoenix Divers (less when booked online ahead; Oct 2026).
Gas and fills
- Gas: Phoenix Divers fills nitrox 32–40% (THB 250 per tank) and runs the Nitrox course; trimix or CCR support is not on the websites: ask.
Water and season
- Water: 29–30 °C and visibility up to 30 m from February to April; outside the season visibility can drop to 5–10 m. Mild to moderate current at the caverns; in the deep channel between Koh Haa Yai and Koh Haa Noi (deeper than 40 m) the current can run hard. The surface can be choppy.
Getting around
- Travel: day trips from Ko Lanta (Ban Saladan at the northern tip, with ferries to Phi Phi and Koh Ngai) and in high season from Krabi; also liveaboards from Phuket (4–6 hours by boat) and from Phi Phi (1–2 hours).
Good to know
- Read this first: Koh Haa is a group of five islets in the Andaman Sea, ~25 km west of Ko Lanta, with caverns you dive from a day boat: the chambers of Koh Haa Yai (The Cathedral) and the chimney of Koh Haa Neua (The Chimney). Daylight is in reach; no lines and no cave dives in the usual sense. The requirements come from the dive centres; the sources name no permit or compulsory guide.
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