Oceania (UK: /ˌoʊsiˈɑːniə, ˌoʊʃi-, -ˈeɪn-/OH-s(h)ee-AH-nee-ə, -AY-, US: /ˌoʊʃiˈæniə, -ˈɑːn-/ⓘOH-shee-A(H)N-ee-ə)[4] is a geographical region comprising Australasia, Melanesia, Micronesia, and Polynesia.[5][6] Outside of the English-speaking world, Oceania is generally considered a continent, while Australia is regarded as an island or a continental landmass contained inside of the larger continent of Oceania. Spanning the Eastern and Western hemispheres, at the center of the water hemisphere, Oceania is estimated to have a land area of about 9,000,000 square kilometres (3,500,000 sq mi) and a population of around 44.4 million as of 2022. When compared to the other continents, Oceania is the smallest in land area and the second-least populated after Antarctica.