Micronesia – Yap, Pohnpei & Kosrae

Three of the four states of the Federated States of Micronesia, spread over some 2,500 km of the western Pacific. Yap is known for resident manta rays at shallow cleaning stations, shark dives and southern walls; Pohnpei, a high volcanic island ringed by a barrier reef, offers black-morph mantas, reef passes and outer atolls (Ant/Ahnd and Pakin); Kosrae has an unspoiled fringing reef, drift dives and a few historic wrecks in Lelu and Utwe harbours. Yap's reefs are held under customary village ownership and Pohnpei has a state system of marine protected areas, so access is normally arranged through a local dive operator.

Facts

Best season: Yap: mantas year-round, mating season December–April; Pohnpei: calmest from about May to early October; Kosrae: diving daily except Sunday
Water temperature: Around 28 °C (82–84 °F) at Kosrae; similarly warm at Yap and Pohnpei
Visibility: Often 30 m or more on the outer reefs and atolls; less (5–15 m) at shallow manta stations and in mangrove-fed channels
Medical: There is no decompression chamber on Pohnpei; dive insurance such as DAN is strongly recommended
Protected areas: Yap Manta Sanctuary (2008) and FSM Shark Sanctuary (2015); Pohnpei MPAs need a state permit; Ahnd Atoll and the Utwe-Walung area in Kosrae are UNESCO biosphere reserves
Currents: Strong in channels and passes (Yap channels up to 6 km/h, Palikir Pass, Ahnd); most Kosrae dives are drifts – carry a surface marker

Season

Best months: Dec, Jan, Feb, Mar, Apr
Acceptable: May, Jun, Jul, Aug, Sep, Oct, Nov
Water temperature: 27–30 °C

Diveable all year. In Yap the manta season is Dec–Apr (mating season); summer is wetter but better for dolphins and pilot whales. Pohnpei and Kosrae seasonal data was thin, so the regional pattern is used.

Dive sites (25)

Pohnpei (incl. Ant Atoll)

Ant Atoll (Ahnd) – advanced
Kehpara Island (closed Jan–Jun) – intermediate
Manta Road – 3–27 m, intermediate
Pakin Atoll – advanced
Palikir Pass – 6–37 m, advanced

Yap

Cabbage Patch – 5–30 m, intermediate
Fan Dancer – 2–37 m, intermediate
Gilmaan Wall – 6–45 m, intermediate
Goofnuw Mini Wall – 9–37 m, intermediate
Lionfish Wall – 5–30 m, intermediate
Magic Kingdom – 5–30 m, beginner
Mi'l Channel – 15–30 m, intermediate
Slow & Easy – 6–20 m, beginner
Stammtisch – 5–7 m, beginner
Valley of the Rays – 15–22 m, intermediate
Vertigo – 10–20 m, beginner
Yap Caverns – 3–30 m, intermediate

Kosrae

Hiroshi Point – intermediate
Lelu Harbor PBM Mariner – 21 m, intermediate
Lelu Harbor PBM-5A (north side) – 18 m, intermediate
Lelu Harbor whaling ship – 21 m, intermediate
Leonora (Bully Hayes' ship) – 12–18 m, beginner
Sansun Maru – 18 m, intermediate
The Dwarf Forest – beginner
Walung Drop-Off – intermediate

Operators (3)

Manta Ray Bay Resort & Yap Divers – resort, Colonia, Yap
Pohnpei Surf Club (Pohnpei Surf and Dive Club) – dive centre, Mangrove Bay Hotel marina, Kolonia, Pohnpei
Kosrae Nautilus Resort – Nautilus Divers – resort, Kosrae Nautilus Resort, Yepan, Kosrae

Routes (4)

Site positions are approximate unless marked otherwise and are for orientation only — never for navigation. Wreck penetration needs proper training; always dive with a local guide. Fees, access rules and operator details change; confirm before you travel.