Lake Chad in the context of "Kanem–Bornu Empire"

Chad, officially the Republic of Chad, is a landlocked country in Central Africa. It is bordered by Libya to the north, Sudan to the east, the Central African Republic to the south, Cameroon to the southwest, Nigeria to the southwest (at Lake Chad), and Niger to the west. Chad has a population of 19 million, of which 1.6 million live in the capital and largest city of N'Djamena. With a total area of around 1,300,000 km (500,000 sq mi), Chad is the fifth-largest country in Africa and the twentieth largest nation by area.

Chad has several regions: the Sahara desert in the north, an arid zone in the centre known as the Sahel, and a more fertile Sudanian Savanna zone in the south. Lake Chad, after which the country is named, is the second-largest wetland in Africa. Chad's official languages are Arabic and French with most education and state documents being in French. It is home to over 200 ethnic and linguistic groups. Islam (55.1%) and Christianity (41.1%) are the main religions practiced in Chad.

The Central African Republic (CAR) is a landlocked country in Central Africa. It is bordered by Chad to the north, Sudan to the northeast, South Sudan to the east, the Democratic Republic of the Congo to the south, the Republic of the Congo to the southwest, and Cameroon to the west. Bangui is the country's capital and largest city, bordering the Democratic Republic of the Congo. The Central African Republic covers a land area of about 620,000 square kilometres (240,000 sq mi). As of 2024, it has a population of 5,357,744, consisting of about 80 ethnic groups, and is in the scene of a civil war, which has been ongoing since 2012. Having been a French colony under the name Ubangi-Shari, French is the official language, with Sango, a Ngbandi-based creole language, as the national and co-official language.

The Central African Republic mainly consists of Sudano-Guinean savanna, but the country also includes a Sahelo-Sudanian zone in the north and an equatorial forest zone in the south. Two-thirds of the country is within the Ubangi River basin (which flows into the Congo), while the remaining third lies in the basin of the Chari, which flows into Lake Chad.

Cameroon, officially the Republic of Cameroon, is a country in Central Africa. It shares boundaries with Nigeria to the west and north, Chad to the northeast, the Central African Republic to the east, and Equatorial Guinea, Gabon, and the Republic of the Congo to the south. Its coastline lies on the Bight of Biafra, part of the Gulf of Guinea, and the Atlantic Ocean. Due to its strategic position at the crossroads between West Africa and Central Africa, it has been categorized as being in both geostrategic locations. Cameroon's population of nearly 31 million people speak 250 native languages, in addition to the national tongues of English and French. The capital city of the country is Yaoundé.

Early inhabitants of the territory included the Sao civilisation around Lake Chad and the Baka hunter-gatherers in the southeastern rainforest. Portuguese explorers reached the coast in the 15th century. Fulani soldiers founded the Adamawa Emirate in the north in the 19th century, and various ethnic groups of the west and northwest established powerful chiefdoms and fondoms.

The Saharan languages are a small family of languages across parts of the eastern Sahara, extending from northwestern Sudan to southern Libya, north and central Chad, eastern Niger and northeastern Nigeria. Noted Saharan languages include Kanuri (9.5 million speakers, around Lake Chad in Chad, Nigeria, Niger, and Cameroon), Daza (700,000 speakers, Chad), Teda (60,000 speakers, northern Chad), and Zaghawa (350,000 speakers, eastern Chad and Sudan). They have been classified as part of the hypothetical but controversial Nilo-Saharan family.

A comparative word list of the Saharan languages has been compiled by Václav Blažek (2007).

Hausa Kingdoms (Masarautun Hausa), also known as Hausaland (Kasar Hausa), was a collection of states ruled by the Hausa people, before the Fulani jihads. It was situated between the Niger River and Lake Chad (modern day northern Nigeria). Hausaland lay between the Western Sudanic empires of Ancient Ghana, Mali and Songhai and the Eastern Sudanic empire of Kanem-Bornu.

Hausa oral traditions detail the Bayajidda legend, which describes the adventures of the Baghdadi hero, Bayajidda, culminating in the killing of the snake in a well at Daura and his marriage to the local queen Magajiya Daurama. According to the legend, Bayajidda's descendants founded the Hausa Bakwai (seven "true" states), as well as the Hausa Banza ("bastard" or "illegitimate" states).

The African humid period (AHP; also known by other names) was a climate period in Africa during the late Pleistocene and Holocene geologic epochs, when northern Africa was wetter than today. The covering of much of the Sahara desert by grasses, trees and lakes was caused by changes in the Earth's axial tilt, changes in vegetation and dust in the Sahara which strengthened the African monsoon, and increased greenhouse gases.During the preceding Last Glacial Maximum, the Sahara contained extensive dune fields and was mostly uninhabited. It was much larger than today, and its lakes and rivers such as Lake Victoria and the White Nile were either dry or at low levels. The humid period began about 14,600–14,500 years ago at the end of Heinrich event 1, simultaneously to the Bølling–Allerød warming. Rivers and lakes such as Lake Chad formed or expanded, glaciers grew on Mount Kilimanjaro and the Sahara retreated. Two major dry fluctuations occurred; during the Younger Dryas and the short 8.2 kiloyear event. The African humid period ended 6,000–5,000 years ago during the Piora Oscillation cold period. While some evidence points to an end 5,500 years ago, in the Sahel, Arabia and East Africa, the end of the period appears to have taken place in several steps, such as the 4.2-kiloyear event.

The AHP led to a widespread settlement of the Sahara and the Arabian Desert, and had a profound effect on African cultures, such as the birth of the Ancient Egyptian civilization. People in the Sahara lived as hunter-gatherers and domesticated cattle, goats and sheep. They left archaeological sites and artifacts such as one of the oldest ships in the world, and rock paintings such as those in the Cave of Swimmers and in the Acacus Mountains. Earlier humid periods in Africa were postulated after the discovery of these rock paintings in now-inhospitable parts of the Sahara. When the period ended, humans gradually abandoned the desert in favour of regions with more secure water supplies, such as the Nile Valley and Mesopotamia, where they gave rise to early complex societies.

The earliest presence of Islam in Chad can be traced back to Uqba ibn Nafi, whose descendants can be found settled in the Lake Chad region to this day. By the time Arab migrants began arriving from the east in the fourteenth century in sizeable numbers, the creed was already well established. Islamization in Chad was gradual, the effect of the slow spread of Islamic civilization beyond its political frontiers. Among Chadian Muslims, 48% professed to be Sunni, 21% Shia, 23% just Muslim and 4% Other.

Islam in Chad was not influenced much by the great mystical movements of the Islamic Middle Ages, nor the fundamentalist upheavals that affected other countries. Consistent contact with West African Muslim traders and pilgrims may be the reason Chadian Muslims identify with the Tijaniyya order. Similarly, in the mid-nineteenth century, the Senusiyya brotherhood was founded in Libya, which benefited from economic and political influence in the Lake Chad Basin around 1900. An Islamic revival movement, feared by some French, led by Sanusi fanatics, Chadian adherents, limited to the Awlad Sulayman Arabs and the Toubou of eastern Tibesti, have never been numerous.