This dive site, Mosquito Island (also known as Koh Yung), is the remotest of the Phi Phi Islands, situated approximately 5km off the northern tip of Koh Phi Phi Don. Its eastern side features a narrow, 700-meter rocky cliff that is fringed by a vibrant coral reef. Divers and snorkelers typically explore along this reef, which offers easy navigation due to its shallow depths. There is no specific historical background provided, but it is known for its natural beauty. It is currently closed to all tourist boats by the Department of National Parks, with no official date for reopening.
The coral reef ecosystem at Mosquito Island supports a diverse array of tropical marine life. Expect to encounter various reef fish species such as colorful parrotfish, angelfish, clownfish, and snappers, darting amongst the coral formations. Both hard and soft corals carpet the seabed, providing essential habitat for countless smaller invertebrates, including nudibranchs, crabs, and shrimps. Occasional sightings of juvenile reef sharks or turtles might also occur in this protected environment.
The best time to visit the Phi Phi Islands for diving and snorkeling is generally during the dry season, from November to April, when the weather is calm, and underwater visibility is at its peak. This shallow site is perfectly suited for beginner scuba divers, snorkelers, and freedivers due to its manageable depths and rich marine biodiversity. However, it is crucial to check the latest updates regarding its temporary closure by the Department of National Parks before planning any trip to Mosquito Island.

