Similan Islands, Koh Tachai & Koh Bon

Similan Islands

Dive Sites

Here are some of the most beautiful and diverse dive sites in Thailand, day trips and liveaboards to the islands are among the most popular worldwide. They consist of nine islands of granite rock with partially lush tropical vegetation, lapped by crystal clear water and lined partly with fine white sandy beaches. The islands stretch over 25 kilometers, like a pearl necklace, from north to south on the Andaman Sea and located 65 kilometers off the coast of Phang Nga province. They were declared a Marine National Park in 1982.

The Similans are ideal for observing or photographing small fish by its enormous biodiversity of tropical reef fish. But not only small fish visit here, even Leopard sharks or White and Blacktip sharks are not rare also Manta rays and Whale sharks can be seen. You can visit the Similan Marine National Park from October to May on day trips or overnight trips, but you will find the best conditions from November to April.

Our guests are picked-up at the hotel and then taken by taxi to our pier in Tablamu, south of Khao Lak.
(see schedule below)

Rules for the Similan National park

1. For bookings, we need the first name, family name, nationality, date of birth and passport number
2. For divers also: dive level, number of logged dives,
date of the last dive & dive certificate
3. Visitors must carry a copy or picture of their passport with
them
4. Drone flights are strictly prohibited
5. Beginner’s courses (Try Dives, OWD) are not allowed – only at Surin Islands and local dive sites
6. Single-use plastic is not allowed to take
7. Bookings have to be done latest 6:00 pm, the day before trip starts
8. Cancellations have to be done latest 12:00 noon, the day before trip starts

Since there are only limited tickets per day for the Similan National Park, we strongly advise you to book tours well in advance - especially for diving packages!

Koh Bon

Manta Ray at Koh Bon

Koh Bon is located about 20 kilometers north of Similan Island #9 and features one of the only vertical walls in Thailand. The main dive site is on the southwestern point and has a step-down ridge that carries on to depths of over 45 meters. The eastern side of this ridge forms the wall and this is where most divers will enter the water and generally where the boat moor.

The western side of the ridge is more of a gentle slope with coral bommies forming mushroom-like formations out of the finger corals. On the ridge itself, sea fans of different sizes, shapes and colors grow, and schooling fish swim in the current feeding. This is generally where most divers will sit most of the dive, hoping for a sighting of the manta rays which frequent visit this dive site. These creatures seem to travel from Bon to Tachai and back again during the diving season from October until May.

There is a pinnacle in the bay just to the north of the ridge. It's a deep rock but if you are an experienced diver it's worth the short bottom times you'll get as it's a very special site. Not all boats visit it and if conditions are not good (like the current is running strong), it's not worth the effort. But if the water is clear you're good with your air and the current is slack it's a stunning rock. It looks like a monolithic temple built by some ancient culture.

Course of the tour

Pick-up from your hotel between 7:30am and 8:30am - depending on location. Our speedboat Kalamang Dee 18 departs at 9:00 am from the pier in Tablamu, south of Khao lak, off

Arrival time
Similan Islands around 10:30am
Koh Tachai around 11:00am
Koh Bon (2nd dive) around 13:00

First we conduct our first dive with professional guides and right after that we have a 90 minutes lunch break on board. Then we prepare for the second dive.

We are back at the pier around 4:00pm - depending on the dive destination - on Wednesdays around 6:15pm because that's when we do 3 dives.
Our taxi will then take you back to your resort.


Pickup times
Nam Khem: 07:30am
Bang Sak: 07:40am
Pak Weep: 07:45am
Pakarang: 07:50am
Khuk Khak: 08:05am
Bang Niang: 08:10am
Nang Thong: 08:15am
Lam Kaen: 08:20am



Since we do not regularly take snorkelers with us due to lack of capacity, we are happy to arrange day trips for snorkelers by speedboat
to the Similan or Surin Islands where they will receive full attention.