Mele Island also known as Hideaway Island is a Polynesian outlier

Polynesian outlier

Polynesian outliers are a number of culturally Polynesian islands which lie in geographic or political Melanesia and Micronesia. Based on archaeological and linguistic analysis, these islands are believed to have been colonized by seafaring Polynesians, mostly from the area of Tonga, Samoa and...

 and islet

Islet

An islet is a very small island.- Types :As suggested by its origin as islette, an Old French diminutive of "isle", use of the term implies small size, but little attention is given to drawing an upper limit on its applicability....

 in Vanuatu

Vanuatu

Vanuatu , officially the Republic of Vanuatu , is an island nation located in the South Pacific Ocean. The archipelago, which is of volcanic origin, is some east of northern Australia, northeast of New Caledonia, west of Fiji, and southeast of the Solomon Islands, near New Guinea.Vanuatu was...

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The island is owned by the local Mele villagers, but is leased to the owners of Hideaway Island. The island is accessed by a boat service from the nearby mainland and offers accommodation and watersports to visitors.

It is famous for having the world's only underwater post office, which is open daily and allows visitors to post letters that are postmarked in a waterproof manner.