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Mosquito Island (also known as Koh Yung) is the remotest of the Phi Phi Islands. It is located approximately 3 miles/5km off the northern tip of Koh Phi Phi Don. It has on its East side a narrow rocky cliff about 700 meters long, fringed by a coral reef, which can be snorkeled during boat tours.

Mosquito Island is temporarily closed to all tourist boats by the Department of National Parks, with no official date for reopening. Please check the last updates before traveling.

Mosquito Island, Thailand
Mosquito Island.

How to go snorkeling Mosquito Island?

Mosquito Island is mainly reached from Ko Phi Phi Don, in approximately 45 to 60 minutes by longtail boat.

A snorkeling stop on the reef bordering the island is included in most day or half-day tours sold in Ko Phi Phi. Most tours include stops on several snorkeling spots, including Maya Bay, Monkey Beach or Bamboo Island.

Mosquito Island snorkeling map, Thailand

Water entrance for snorkeling Mosquito Island

Water entrance is directly from the boat.

Mosquito Island snorkeling exploration tips

The snorkeling area covers the narrow fringing reef bordering the East side of Mosquito Island. The coral reef is badly damaged, and you shouldn’t expect vibrant seabed, even if some coral areas are still quite healthy.

Copperband butterflyfish at Mosquito Island
A copperband butterflyfish in Mosquito Island.

Nevertheless, you can still spot a good variety of fish in the area, including some of the finest species of Andaman Sea, such as the copperband butterflyfish and the Moorish Idol.

Giant clam at Mosquito Island
Maxima clams at Mosquito Island’s reef.

This spot is popular with schools of surgeonfish and parrotfish grazing on the seabed, raising clouds of sand. In the cracks of the reef, you may also spot moray eels. The reef flat is also home to dozens of giant clams, making Mosquito Island a great location to take photos of their fluorescent mantles.

Restaurant and accommodation on Mosquito Island

There are no restaurants and no water supply on the island. Ask your tour guide for details about what is included in the tour, and at least take with you some snacks and drinks.


  • Level required Beginner
  • Protected areaHat Noppharat Thara-Mo Ko Phi Phi National Park
  • Maximum depth18ft/6m
  • Water entranceEasy, from a boat
  • LifeguardNo
  • Visitor numbersMedium
  • Access costsSnorkeling tour price
  • Restaurants nearbyNo
  • Public toilets & showersNo

MAP Spot

These snorkeling spots are accessible to beginners and kids. You will enter the water gradually from a beach, or in a less than 3ft. deep area. The sea is generally calm, shallow, with almost no waves or currents. These spots are usually located in marked and/or monitored swimming areas. It is not necessary to swim long distances to discover the sea life.

This level only apply when the spot experiences optimal sea and/or weather conditions. It is not applicable if the sea and/or weather conditions deteriorate, in particular in the presence of rough sea, rain, strong wind, unusual current, large tides, waves and/or swell. You can find more details about the definition of our snorkeling levels on our snorkeling safety page.