11 Nauru Oceania-wikimedia commons public domain.jpg

Wikimedia Commons/Public Domain

Visit the smallest and least-visited republic in the world, with a single island of just 21 sq. km. (13 sq. m.) The oval shaped coral island is located just 25 miles south of the Equator.

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Nauru is surrounded by a coral reef and ringed by windswept palm trees and a sandy beach. The diving conditions are world class, according to World Atlas.