Oceania (UK: / ˌ oʊ s i ˈ ɑː n i ə, ˌ oʊ ʃ i-,-ˈ eɪ n-/, US: / ˌ oʊ ʃ i ˈ æ n i ə / (), /-ˈ ɑː n-/) is a geographical region that includes Australasia, Melanesia, Micronesia, and Polynesia. Spanning the Eastern and Western hemispheres, Oceania is estimated to have a land area of 8,525,989 square kilometres (3,291,903 sq mi) [] and a population of over 41 million.