Australia (continent) of the continent of Australia, but of the separate, submerged continent of Zealandia. New Zealand and Australia are both part of the Oceanian sub-region known as Australasia, with New Guinea being in Melanesia. The term Oceania is often used to denote the region encompassing the Australian continent, Zealandia and various islands in the Pacific Ocean that are not included in the seven-continent model. Papua New Guinea, a country within the continent, is one of the most culturally and linguistically diverse countries in the world. It is also one of the most rural, as only 18 percent of its people live
Smallest organisms montane environments. There is relatively little data on size variation among individuals, growth from metamorphosis to adulthood or size variation among populations in these species. Additional studies and the discovery of further minute frog species are likely to change the rank order of this list. The dwarf gecko ("Sphaerodactylus ariasae") and the Virgin Islands dwarf sphaero ("S. parthenopion"), two geckos in the genus "Sphaerodactylus", are the world's smallest known reptile species and smallest lizard, with a snout-vent length of . A few "Brookesia" chameleons from Madagascar are equally small, with a reported snout-vent length of 15–18 millimetres for male dwarf