Scenery of Vanuatu. [Photo/Official WeChat Account of Voice of Diplomacy]

4. The Republic of Vanuatu

The Republic of Vanuatu is located in the south Pacific Ocean between Hawaii and Australia. Among its more than 80 islands, 68 are inhabited. In Vanuatu you'll find amazing oceanic scenery, an accessible and active volcano on the southeast coast, the island of Tanna, a primitive ethnic village, and the world's only underwater post office in the capital, Port Villa.

Language: English, French, and Bislama

What you need to do: Send a postcard from the underwater post office