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    Yap Island (Yappu) Yap State Federated States of Micronesia
Location
Yap Island is the largest island in the Yap Island Group (Yap Islands) surrounded by the Pacific Ocean. Also known as Yappu. To the east is Gagil-Tamil Island and to the northeast is Maap Island and Rumung Island. Prewar and during the Pacific War located in the Caroline Islands. Today located in Yap State in the Federated States of Micronesia.

Prewar
Germany administered the Caroline Islands after the Spanish-American War. During World War I during 1914, British warships shelled the German plantation owner's radio station. On October 7, 1914, a Japanese Expeditionary Squadron landed on Yap and occupied the island. Afterwards, a secret treaty agreement between Japan and Britain guaranteed Japanese control over all Pacific islands north of the Equator was incorporated into the Treaty of Versailles in 1919.

By 1920, Japanese settlement began on Yap. After Japan withdrew from the League of Nations on March 27, 1933, Yap was fortified as a military base. During the Japanese occupation, Yapese natives were forced to work in labor gangs at nickel, bauxite and phosphate mines on the island.

Wartime History
During the Pacific War, the Japanese began intensive gardening in a large portion of southern Yap. Starting at the end of March 1944 Yap was within range of U.S. bombers and late U.S. Navy carrier planes until neutralized.

American missions against Yap
March 30, 1944–October 30, 1944

The Japanese garrison on Yap continued to defend until the official surrender of Japan. On September 5, 1945 a Japanese Daihatsu barge with Col. Eto Daihachi, commander of the Japanese garrison surrendered aboard USS Tillman (DD-641).

Colonia (Doanguuc, Korronii, Kolonie, Yap Town)
Colonia is located on southern Yap Island includes Colonia Airfield and Tomil Airfield.

A6M Zero
Ditched in shallow water off Yap.

B-24J Liberator Serial Number 44-40598
Pilot Coleman MIA June 25, 1944 shot down by fighters

B-24J Liberator Serial Number 44-40555
Pilot Sylor MIA July 15, 1944 mid air collision with B-24J 42-73119 roughly 5-8 miles south of Yap.

B-24J Liberator Serial Number 42-73119
Pilot Diederich MIA July 15, 1944 mid air collision with B-24J 44-40555 roughly 5-8 miles south of Yap.

References
Yap's Air Campaign by Richard Dunn
MissingAircrew - American Missions Against Yap, 13 August 1944

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Last Updated
September 8, 2025

 

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