Diver Atlasdiveratlas.com

Similan Islands · liveaboard

Koh Bon (West Ridge)

Editorial plate — compiled from published sources, not yet confirmed by a verified diver. Dived here? Verify this plate.

Koh Bon, Mu Ko Similan National Park

8.81670°N, 97.79000°E

Koh Bon's limestone wall and western ridge host a manta cleaning station and are among the Similans' best bets for mantas.

Depth
5–40 m
Vis
15–40 m

26–29 °C

Current
strong
Health
Unscored

Awaiting verified ratings

Geo (surface approx.)
8.81670°N, 97.79000°E

Approximate position from published sources.

Entry / access
liveaboard

Entry point depends on the current: divers usually start in a sheltered southern bay and follow a wall that deepens westward before turning into an uneven ridge with plateaus either side. A coral pinnacle on the north side works as a manta cleaning station, and divers are asked not to hover over it. A separate, deeper pinnacle west of the island is only dived in good conditions.

Difficulty
intermediate

Intermediate to advanced; the deep pinnacle is for experienced divers

Best season
Nov–Apr; mantas peak Apr–May
Last reviewed
20 Oct 2026 by editorial

Hazards

  • high · Strong currents that change quickly
  • medium · Rough surface conditions
  • medium · Depth on the ridge plateaus (24–35 m)

Marine life

Typical: oceanic manta ray, leopard shark, whitetip reef shark, eagle ray, banded sea snake, titan triggerfish, napoleon wrasse, banded boxer shrimp

Durable site rating

Multi-axis score

Separate axes — not one vague star, and not today's water. Public rollup is the 0 verified ratings on this plate. This is not a community count.

No verified ratings on this plate yet. Self-declared scores stay off it until a centre attests the author.

File today's conditions — timestamped, separate from this score.

Checking verification…

No verified snapshot yet. Public rollup uses verified reports only. Typical conditions above are the encyclopedia baseline, not today's water. Report today's conditions.

Condition reports

What it was like — no verified reports yet.

No verified reports yet.

File a snapshot after the dive. It stays on this device until a centre verifies you.

Report today's conditions

Living record

Change log — no attributed edits yet.

Structured field edits, named and attributed. Anyone can read. Phase 1: published on submit · centre-verified authors only. There is no staff moderation queue — this log is the record.

0 attributed edits on this plate

Checking verification…

Questions people search

How deep is Koh Bon (West Ridge)?

5–40 m.

Is Koh Bon (West Ridge) suitable for beginners?

intermediate — Intermediate to advanced; the deep pinnacle is for experienced divers

Sources

Where sources disagree

IDC gives season Oct–May; Dive The World gives Nov–Apr.

Listed by: Indepth Dive Centre (IDC Phuket), Wicked Diving

Durable multi-axis scores sit on the rating plate. File a timestamped condition report, CoralWatch colour, or debris card on today's report. Public averages stay verified-only. Book at an Andaman dive centre.