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Its largest and most populated island, [[Tongatapu]], on which the capital city of Nuku'alofa is located, covers 257 square kilometers (99 sq. mi.). Geologically the Tongan islands are of two types: most have a limestone base formed from uplifted coral formations; others consist of limestone overlaying a volcanic base.

Its largest and most populated island, [[Tongatapu]], on which the capital city of Nuku'alofa is located, covers 257 square kilometers (99 sq. mi.). Geologically the Tongan islands are of two types: most have a limestone base formed from uplifted coral formations; others consist of limestone overlaying a volcanic base.

Its population is about 100,000, mostly [[Christian]] and almost entirely Tongan in ethnicity.  Their literacy rate is nearly 100%.

Its population is about 100,000, mostly [[Christian]] and almost entirely Tongan in ethnicity.  Their literacy rate is nearly 100%. Thanks to missionary work, about a third of Tongans are [[Mormon]], making Tonga the place with the greatest concentration of Mormons outside [[Salt Lake City]].<ref>''Condensed Knowledge'', New York: Random House, 2008.</ref>

Its government is a Constitutional hereditary monarchy, based on a [[constitution]] drafted in 1875 and revised in 1970, when it obtained its independence from [[Britain]].  Its [[GDP]] is US$148.9 million, and its per capita GDP is US$1,287.  Its major natural resource is [[fish]].

Its government is a Constitutional hereditary monarchy, based on a [[constitution]] drafted in 1875 and revised in 1970, when it obtained its independence from [[Britain]].  Its [[GDP]] is US$148.9 million, and its per capita GDP is US$1,287.  Its major natural resource is [[fish]].