New Guinea (also known by other names) is the world's second largest island, after Greenland, covering a land area of 786,000 km2. Located in the southwest Pacific Ocean, it lies geographically to the east of the Malay Archipelago, with which it is sometimes included as part of a greater Indo-Australian Archipelago.
Geologically, New Guinea is a part of the same tectonic plate as Australia. When world sea levels were low, the two shared shorelines (which now lie 100 to 140 metres below sea level), combining with lands now inundated into the tectonic continent of Sahul, also known as Greater Australia. The two landmasses became separated when the area now known as the Torres Strait flooded after the end of the last glacial period.
Anthropologically it is considered part of Melanesia.[citation needed] Politically, the western half of the island comprises two Indonesian provinces: Papua and West Papua. The eastern half forms the mainland of the country of Papua New Guinea. New Guinea has a population of about 7.5 million who inhabit a land with a hot humid rainy climate. The constantly dripping rain forests cover a high mountain-dominated interior with features rapidly descending to the sea coast. It has a very low population density of only 8 inh/km2.
Guinea i/ˈɡɪni/, officially the Republic of Guinea (French: République de Guinée), is a country in West Africa. Formerly known as French Guinea (Guinée française), it is today sometimes called Guinea-Conakry to distinguish it from its neighbour Guinea-Bissau and the Republic of Equatorial Guinea. Guinea has almost 246,000 square kilometres (94,981 sq mi) and a population of 10,057,975. It forms a crescent by curving from its western border on the Atlantic Ocean toward the east and the south. Its northern border is shared with Guinea-Bissau, Senegal, and Mali, the southern one with Sierra Leone, Liberia, and Côte d'Ivoire. The Niger River's source is in the Guinea Highlands in southeastern Guinea.
Guinea is geographically divided into eight administrative regions and subdivided into thirty-three prefectures. Conakry is the capital, largest city and economic centre. The other major cities in the country include Kankan, Nzérékoré, Kindia, Labe, Guéckédou, Mamou and Boke.
Guinea's 10 million people belong to twenty-four ethnic groups. The largest and most prominent groups are the Fula 40%, Mandingo 30%, and Susu 20%.
The term black people is used in some socially-based systems of racial classification for humans of a dark-skinned phenotype, relative to other racial groups represented in a particular social context. Different societies apply different criteria regarding who is classified as "black", and often social variables such as class and socio-economic status also play a role, so that relatively dark-skinned people can be classified as white if they fulfill other social criteria of "whiteness" and relatively light-skinned people can be classified as black if they fulfill the social criteria for "blackness" in a particular setting.
As a biological phenotype being "black" is often associated with the very dark skin colors of some people who are classified as "black". But, particularly in the United States, the racial or ethnic classification also refers to people with all possible kinds of skin pigmentation from the darkest through to the very lightest skin colors, including albinos, if they are believed by others to have African ancestry, or to exhibit cultural traits associated with being "African-American". As a result, in the United States the term "black people" is not an indicator of skin color but of socially based racial classification.