Ulithi o͞olē´thē [key], atoll comprising 40 islets, 1.75 sq mi (4.53 sq km), W Pacific, in the W Caroline Islands. Ulithi is part of the Federated States of Micronesia; Mokomok is the chief village. The atoll became (1920) part of the Japanese mandate in the Pacific and was strongly fortified. The main atoll has an excellent lagoon for anchoring large ships, and after the American capture (1944) of Ulithi in World War II, it was used as a rendezvous station for naval units.
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