Koh Bon Pinnacle, Similan Islands

Koh Bon Pinnacle is a deep dive site in the Similan Islands that feels utterly remote – and where anything could show up out of the blue.

B over the yellow corals, Koh Bon Pinnacle, Similan Islands, Thailand April 2023 © [email protected]

While it’s located only a couple hundred metres from the shoreline of Koh Bon island, Koh Bon Pinnacle feels like it’s in the middle of nowhere.

Batfish, Koh Bon Pinnacle, Similan Islands, November 2024 © [email protected]

It’s a fairly small, deep pinnacle with its highest point at 12 metres but the majority of the pinnacle’s huge slabs of rock starting at 20 metres.

Filefish around fan coral, Koh Bon Pinnacle, Similan Islands, Thailand, May 2024 © [email protected]

Usually only dived when the visibility is good, seeing the site below you as you descend feels like skydiving towards some lost temple in the jungle, thanks to the bright yellow soft coral growth that covers the pinnacle’s jutting rocks.

Pook and the yellow coral, Koh Bon Pinnacle, Similan Islands, Thailand, December 2024 © [email protected]

You can easily see one side of the pinnacle from the other, and looking out into the blue feels suitably panoramic.

As it’s so near to Koh Bon, manta rays have been known to fly over the pinnacle but it’s not really a hotspot.

Hundreds of batfish, Koh Bon Pinnacle, Similan Islands, November 2024 © [email protected]

The resident batfish are always good value hovering around the lower ledges of the plateau and big batfish schools hundreds strong sometimes pass by in the blue.

When the water temperature drops, big marble rays can often be spotted on the edges of the pinnacle before the sheer drop down into the depths.

Sea snake, Koh Bon Pinnacle, Similan Islands, Thailand, MAy 2024 © [email protected]

Amongst the corals covering the pinnacle’s rocks there’s the usual tropical fish suspects and the occasional sea snake.

Yellow coral and diver, Koh Bon Pinnacle, Similan Islands, Thailand April 2023 © [email protected]

Koh Bon Pinnacle is one of the most atmospheric and individual looking dive sites you can dive on a similar liveabaord. The conditions have to be right – good viz to see it properly and not too much current otherwise you risk getting blown off the site before you even reach the rocks. If all goes to plan, it’s a beautiful and memorable spot to explore.

Recommended Similan Liveaboards October 2025 to May 2026

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Similan Islands Dive Sites List

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(The Similan National Park is closed from mid May to mid October each year)

Similan Liveaboards Trip Reports

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Similan Islands Liveaboard Trip Report December 2022

Similan Dive Sites

Richelieu Rock

Thailand’s best dive site, bar none. A stunning array of soft corals and spectacular stampeding marine life. Read More

Koh Bon

Thailand’s manta ray hotspot, with plenty of other things to see if the mantas don’t show up. Read More

Koh Tachai

Koh Tachai is one of the Similan Islands’ best dive sites but also one of the most volatile. Massive fans, huge schools of fish, maybe manta rays – it’s all to play for. Read More

Boulder City

A dramatic deep water Similan dive site, Boulder City needs the right conditions to explore as it’s exposed to wind and wave from all sides. Read More

Shark’s Fin Reef

A dramatic block of rock rising out of the sand, Shark’s Fin Reef is one of the Similan Islands’ most exciting sites. Read More

Hideaway Bay

Two Similan Islands dive sites in one location, Hideaway Bay and Tuna Wreck can be experienced in a single dive. Read More

North Point

North Point is another of the Similans’ signature big boulder sites, with huge great rocks rising out of the white sand. Read More

Koh Bon Pinnacle

Koh Bon Pinnacle is a deep dive site that feels utterly remote – and where anything could show up out of the blue. Read More

West Of Eden

A big boulder site with spectacular outsize fan corals, beautiful soft corals and the promise of full fish activity, West Of Eden is an archetypal Similan Islands dive site. Read More

Ao Suthep, Surin Islands

Ao Suthep is beautiful hard coral garden in the Surin Islands, often visited by Similan island diving liveaboards and accessible by snorkellers visiting the Surin Islands too. Read More

Three Trees

Three Trees, named after the three trees directly above the dive site on Similan Island 9, is a big wide white sand channel with some awesome corals and fish encounters. Read More

Christmas Point

One of the signature Similan Islands big boulder dive sites, Christmas Point’s huge rocks have been shaped by the tides over hundreds of years. Read More

Koh Bon Pinnacle, Similan Islands – Thailand Dive Sites