Pink Dolphins Near Khanom: A Trip From Koh Samui

A dolphin that surfaces not grey, but pink — it's real, and one of the best places in the world to see it is just a boat ride from Koh Samui: the bay off Khanom. Here's where Khanom is, how realistic a sighting actually is, and how a day trip there works.

Where can you see pink dolphins?

The "pink dolphins" are Indo-Pacific humpback dolphins (Sousa chinensis), found in warm, shallow coastal waters across South and Southeast Asia and off southern China. In Thailand, the coast off Khanom, in Nakhon Si Thammarat province on the mainland across the Gulf of Thailand from Koh Samui, is the best-known place to spot them. Pink-coloured humpback dolphins are also well known from Hong Kong, where the same species has been observed for decades.

Are pink dolphins rare?

Yes, in two ways. The Indo-Pacific humpback dolphin is considered an endangered species, with small, often isolated populations along the coast. And Khanom is one of only a handful of places worldwide where a resident group can be watched this close to shore. Exact numbers for the local population vary by source — some travel sites put it at 100 to 150 animals across the wider area, while others cite official estimates of around 60. No single reliable, current count could be confirmed; either way, it's a small, protected population, not a guarantee on any given trip.

Why are some dolphins pink?

The colour isn't a pigment. Calves are born dark grey, and as they age they lose that colouring and appear paler — in some adults, eventually pink to white. The reason lies in blood vessels close to the skin's surface: in warm water, the dolphins shed heat through the skin, much like a person flushing when they're warm. The more blood flows through those vessels, the more strongly pink the skin appears — an effect that's often more pronounced in active, excited animals.

How likely is a sighting?

Honestly, there's no guarantee. These are wild animals in open water, not a marine park with feeding shows. Guides head for areas where the dolphins are known to be active, but whether and how many appear on a given day depends entirely on the animals themselves. Any operator promising a guaranteed sighting is overselling it.

For respectful viewing: keep your distance, don't feed or touch the dolphins, and don't steer the boat straight at them — let them approach in their own time.

How the trip works

A typical itinerary, based on the tour on kohsamui.tours:

• Hotel pick-up between roughly 7:45 and 9:15am, then on to the departure pier at Thong Krut in the south of Koh Samui.
• Crossing by speedboat from around 9:15 or 9:45am, past outlying islands and the distinctive "Pancake Stone" off Khanom — dolphins are often spotted here already.
• Lunch with Thai seafood.
• Snorkelling at the reef off Koh Tan, about 20 minutes away.
• Stop at Koh Mudsum (Pig Island) with time to swim or relax on the beach; the 50 THB entrance fee isn't included in the tour price.
• Return to Koh Samui by speedboat, arriving back around mid-afternoon.

from 1,850 THBKoh Samui Pink Dolphin tour Khanom★★★★★4.79 from 106 reviews

For something more private, there's a version with your own boat, a beach picnic and the same route past the dolphins, Koh Tan and Koh Mudsum:

from 24,950 THBHalf Day Luxury Boat Tour To Khanom - Watch Pink Dolphins★★★★★4.79 from 106 reviews

What else is there in Khanom?

Khanom is more than just the dolphins. The area is a quiet stretch of coast with long, uncrowded beaches. Well-known spots include viewpoints such as Laem Prathap overlooking the Gulf of Thailand, caves in the limestone hills, and boat trips past rugged rock formations and mangroves — the latter can also be explored by kayak.

What's the best time to visit Khanom?

The dry season, from December to April, is generally the best window: calmer seas, better visibility and a more comfortable crossing. During the rainy season, roughly October to December on both Koh Samui and the mainland opposite, the sea can get rougher and tours are adjusted as needed. The season mostly affects how comfortable the ride is — whether dolphins appear isn't directly tied to it. For more on how the weather changes through the year, see Koh Samui weather and the truth about the rainy season.

Frequently asked questions

Where can you see pink dolphins?

In Thailand, the best-known spot is off Khanom in Nakhon Si Thammarat province, across from Koh Samui. They're Indo-Pacific humpback dolphins, the same species known for its pink colouring off Hong Kong.

Are pink dolphins rare?

Yes. The Indo-Pacific humpback dolphin is considered endangered, and Khanom is one of only a few places where a resident group can be seen close to shore. Estimates for the wider local population range from a few dozen to around 150 animals, depending on the source.

Why are some dolphins pink?

The colour isn't a pigment — it comes from blood vessels near the skin's surface that help the dolphins shed heat in warm water. Calves are dark grey and lighten with age, in some individuals eventually turning pink or white.

What's the best time to visit Khanom?

The dry season from December to April, for calmer seas and better visibility. There's no sighting guarantee at any time of year.

For more day trips around Koh Samui, see our article on Pig Island (Koh Madsum), also visited on this tour, and our guide to the day trip to Koh Nang Yuan and Koh Tao.