Hiva Oa hē´vä ō´ä [key], volcanic island, 154 sq mi (399 sq km), South Pacific, second largest and the most important of the Marquesas Islands , French Polynesia . Hiva Oa is the seat of Atuona, former capital of the Marquesas. The Bay of Traitors, protected by ridges c.3,000 ft (910 m) high, provides a good harbor. Copra is the chief export.
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