- Area > Comparative: The area of various small countries expressed in comparison to various areas within the United States of America.
- Area > Land: Total land area in square kilometres
- Area > Land > Per capita: Total land area in square kilometres Per capita figures expressed per 1,000 population.
- Area > Total: Total area in square kilometers
- Area > Water: Total water area in square kilometers
- Climate: A brief description of typical weather regimes throughout the year.
- Coastline: The total length of the boundary between the land area (including islands) and the sea.
- Geographic coordinates: This entry includes rounded latitude and longitude figures for the purpose of finding the approximate geographic center of an entity and is based on the Gazetteer of Conventional Names, Third Edition, August 1988, US Board on Geographic Names and on other sources.
- Geographic location: Geographic location of island countries.
- Land area > Sq. km: Land area is a country's total area, excluding area under inland water bodies, national claims to continental shelf, and exclusive economic zones. In most cases the definition of inland water bodies includes major rivers and lakes."
- Land area > Square miles: Country land area.
- Location: The country's regional location, neighboring countries, and adjacent bodies of water.
- Natural resources: A country's mineral, petroleum, hydropower, and other resources of commercial importance.
- Surface area > Sq. km: Surface area is a country's total area, including areas under inland bodies of water and some coastal waterways.
- Terrain: A brief description of the topography
SOURCES: CIA World Factbooks 18 December 2003 to 28 March 2011; All CIA World Factbooks 18 December 2003 to 18 December 2008; Wikipedia: List of island countries (Sovereign states); Food and Agriculture Organisation, electronic files and web site.; British Broadcasting Corporation 2014; World Development Indicators database
"Tonga Geography Stats", NationMaster. Retrieved from http://www.nationmaster.com/country-info/profiles/Tonga/Geography
"Tonga Geography Stats, NationMaster." 1961-2014. <http://www.nationmaster.com/country-info/profiles/Tonga/Geography>.
'Tonga Geography Stats, NationMaster', <http://www.nationmaster.com/country-info/profiles/Tonga/Geography> [assessed 1961-2014]
"Tonga Geography Stats", NationMaster [Internet]. 1961-2014. Avaliable from: <http://www.nationmaster.com/country-info/profiles/Tonga/Geography>.
"Tonga Geography Stats", NationMaster. Avaliable at: nationmaster.com. Assessed 1961-2014.
"Tonga Geography Stats, NationMaster," http://www.nationmaster.com/country-info/profiles/Tonga/Geography (assessed 1961-2014)
"Tonga Geography Stats", NationMaster, http://www.nationmaster.com/country-info/profiles/Tonga/Geography (last visited 1961-2014)
"Tonga Geography Stats", NationMaster, http://www.nationmaster.com/country-info/profiles/Tonga/Geography (as of 1961-2014)