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

How to get to Mosquito Island for snorkeling?

Mosquito Island is mainly accessible 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 several day tours from Ko Phi Phi. Most excursions include stops at other snorkeling spots, especially Maya Bay, Monkey Beach or Bamboo Island. The half day excursion (including a meal and refreshments) costs on average 1500 to 2000 baht per person from Ko Phi Phi.

Mosquito Island, Thailand

Entering the water in Mosquito Island

The trip organizer will take you to the reef, and you can enter the water directly from the boat.

Mosquito Island snorkeling map, Thailand

Mosquito Island snorkeling exploration

The area to explore covers the narrow fringing reef bordering the East side of Mosquito Island. The coral reef have been particularly damaged, and you shouldn’t expect vibrant sea beds, even if some coral areas are still quite healthy. Nevertheless, you can still observe a good variety of fish, including some of the finest species of Andaman Sea, as copperband butterflyfish (chelmon rostratus) or Moorish Idol (zanclus cornutus).

Copperband butterflyfish at Mosquito Island

You will without doubt come across schools of surgeonfish and parrotfish grazing on the seabed, raising clouds of sediment. In the cavities dug out in the rocks, try to spot an unsuspecting young moray eel. The reef flat is also colonized by dozens of giant clams, making this spot an ideal place to take close-ups pictures of their bright and magnificent mantles.

Giant clam at Mosquito Island

Restaurant and accommodation in 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 along a snack and something to drink.


  • 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

Mosquito Island is currently closed to all tourist boats by the Department of National Parks until further notice, in an attempt to allow the coral reefs recover from overcrowding.

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.