Its land area is 21 km2 and it has a 30 km coastline. Maritime claims are a 200 nautical mile exclusive fishing zone, and a 12 nautical mile territorial sea.
The climate is tropical with a monsoonial rainy season from November to February.
A sandy beach rises to the fertile ring around raised coral reefs. The raised phosphate plateau ('Topside') takes up the central portion of the island. The highest point is 61m above sea level along the plateau rim.
Nauru's only natural resources are phosphates, formed from guano deposits by seabirds over many thousands of years.
Environmental issues
Nauru is party to the international environmental agreements on Biodiversity, Climate Change, Desertification, Law of the Sea and Marine Dumping.