Borkou-Ennedi-Tibesti Prefecture was the largest of the 14

prefectures of Chad A prefecture (from the Latin ''Praefectura'') is an administrative jurisdiction traditionally governed by an appointed prefect. This can be a regional or local government subdivision in various countries, or a subdivision in certain international ...

between 1960 and 1999. It was transformed into

Borkou-Ennedi-Tibesti Region The Borkou-Ennedi-Tibesti (BET) was until 2008 one of the then 18 regions of Chad, its capital being Faya-Largeau. It comprised the former Borkou-Ennedi-Tibesti Prefecture. Most of the region was part of the Sahara desert. In 2008, this region w ...

, one of the 18 regions into which the country has been divided since 2002. Its name is often abbreviated to BET. Located in the north of Chad it was adjacent to

Libya Libya (; ar, ليبيا, Lībiyā), officially the State of Libya ( ar, دولة ليبيا, Dawlat Lībiyā), is a country in the Maghreb region in North Africa. It is bordered by the Mediterranean Sea to the north, Egypt to Egypt–Libya bo ...

, while also bordering

Niger ) , official_languages = , languages_type = National languagesSudan Sudan ( or ; ar, السودان, as-Sūdān, officially the Republic of the Sudan ( ar, جمهورية السودان, link=no, Jumhūriyyat as-Sūdān), is a country in Northeast Africa. It shares borders with the Central African Republic t ...

. Borkou-Ennedi-Tibesti covered an area of 600,350 km, almost half of Chad's total area. It had a population of 73,185 (as of 1993), partly nomadic and also scattered small towns and other settlements. Its capital was

Faya-Largeau Faya-Largeau (also known as Faya, ar, فايا لارجو or ) is the largest city in northern Chad and was the capital of the region of Bourkou-Ennedi-Tibesti. It is now in the Borkou Region, which was formed in 2008 from the Borkou Departmen ...

Geography

Borkou-Ennedi-Tibesti is located in the

Sahara Desert , photo = Sahara real color.jpg , photo_caption = The Sahara taken by Apollo 17 astronauts, 1972 , map = , map_image = , location = , country = , country1 = , ...

and extends into the

Sahel The Sahel (; ar, ساحل ' , "coast, shore") is a region in North Africa. It is defined as the ecoclimatic and biogeographic realm of transition between the Sahara to the north and the Sudanian savanna to the south. Having a hot semi-arid c ...

. Its diverse topography ranges from the volcanic

Tibesti Mountains The Tibesti Mountains are a mountain range in the central Sahara, primarily located in the extreme north of Chad, with a small portion located in southern Libya. The highest peak in the range, Emi Koussi, lies to the south at a height of and i ...

to the

Bodélé Depression The Bodélé Depression (), located at the southern edge of the Sahara Desert in north central Africa, is the lowest point in Chad. It is 500 km long, 150 km wide and around 160 m deep. Its bottom lies about 155 meters above sea leve ...

, a vast

Holocene The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene togethe ...

lake-bed that is one of the Earth's strongest

dust storm A dust storm, also called a sandstorm, is a meteorological phenomenon common in arid and semi-arid regions. Dust storms arise when a gust front or other strong wind blows loose sand and dirt from a dry surface. Fine particles are transporte ...

producing regions. Overall, the territory is extremely arid.

References

Prefectures of Chad Chadian–Libyan conflict {{Chad-geo-stub