The Guinea Highlands is a densely forested mountainous plateau extending from the southern Fouta Djallon highlands in southeastern Guinea through to northern Sierra Leone and Liberia, and northwestern Côte d'Ivoire .

They form the source of the Niger River, the longest river in western Africa. In Guinea they are known as Dorsale Guinéenne and historically have been isolated. The highest mountain in the region is Mount Nimba which is 1,752 metres (5,748 ft). They mostly however lie between 300 and 500 metres (980 and 1,600 ft) above sea level. Geologically the composition of the sediments in the highlands though are the same as in Upper Guinea and include granites, schists, and quartzites.

The highland region is also linked to the Jos Plateau in Nigeria, in the Adamawa Region, Cameroon Highlands of Cameroon and the Mandingue Plateau near Bamako in Mali.

Yomou is the chief market town for the densely forested region of the Guinea Highlands. Main commodities sold in the town include rice, cassava, coffee, palm oil and kernels. The region is mainly inhabited by the Guerze (Kpelle) and Mano (Manon) peoples.

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%.