
Similan Islands · Thailand · Reef · Coral garden
Snapper Alley
Huge schools of snapper over large hard-coral tables
Area photo: KOSIN SUKHUM · CC BY-SA 4.0
Snapper Alley is southeast of Koh Bangu, the island numbered 9 at the north end of the chain, and is one of the easiest dives in the park: healthy hard coral with large coral tables, normally no current, and the diving done inside the top 10 m. It is known for the huge schools of snapper that hold over the coral, and there are swim-throughs along the way.
Where it is and how deep
8.6733° N, 97.6525° EApproximate position — the dashed circle shows where the site lies; your operator's briefing has the mooring.
The dive
The diving is done in the top 10 m with the sea bottom around 21 m below, so the profile is set by where the coral is rather than by a limit, and with no current normally running the route can be chosen freely and changed halfway through. Large tables of hard coral make up most of the ground, with swim-throughs to pass between them, and the shallow water leaves a wide margin on gas and time.
The snapper are the fixture of the dive: they school over the coral in numbers and are what the site is known for. Around them the site records barracuda, giant trevally, surgeonfish and triggerfish, with whitetip and blacktip sharks, manta rays and even whale sharks on the list of what has been seen here rather than what any one dive should be expected to deliver.
Marine life and season
- Reef fish swarms
- Barracuda
- Trevally & jacks
- Manta rays
- Reef sharks
- Whale sharks
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Prime | Prime | Prime | Good | Off-season | Off-season | Off-season | Off-season | Off-season | Off-season | Good | Prime |
Season follows Similan Islands: Similan National Park closes mid-May to mid-October for monsoon recovery; calm seas and peak manta/whale shark sightings run December-March.
Sources
- Snapper Alley — Divezone
- Snapper Alley — Scubago
More dive sites in Similan Islands
Reef
A coral-covered rock standing alone on the sand
Wreck
The 27 m liveaboard Atlantis X, bow at 16 m
Reef
Longest reef in the Similans, over 300 coral species
Reef
Big granite blocks with reef sharks and Napoleon wrasse
Coral garden
Morning light on a shallow coral garden off Ko Bangu
Granite arches at the exposed north end of the chain
Drift
Strong-current ridge with soft coral gardens and big boulders
Reef
Shallow bay under the duck-shaped rock, with no current
Similar dives elsewhere
Rock canyons and hard coral from the surface to 12 m
Swim-throughs behind walls of glassfish, and no current
Blacktip reef sharks over a granite slope on the western side
A 40 m drop-off on the west side, with 20 to 30 m of visibility



