Guelta d'Archei
Interesting facts
- The crocodiles of Ennedi's canyon pools show signs of dwarfism, an adaptation to thousands of years spent in small, isolated desert waterholes.
- A comparable relict crocodile colony on Mauritania's Tagant Plateau is believed to have died out around 1996, leaving Archei among the very last in the Sahara.
- The West African crocodile living here was long lumped together with the Nile crocodile and has only recently been recognised as a separate species.
- In the language of the local Beri (Zaghawa) people, the guelta's fuller name is said to combine words meaning "desolate land" and "camel well".
- Climate records from Ennedi show rainfall falling from around 250 mm a year some 6,000 years ago to roughly 50 mm by about 2,700 years ago.
- The cliffs around the pool are sandstone laid down between the Cambrian and Carboniferous periods, resting on a far older Precambrian granite base.
- Archei is the best known of at least twenty permanent or semi-permanent springs, pools and gueltas scattered across the Ennedi Plateau.
- Most of Ennedi's rock art is painted rather than engraved, and cattle make up more than half of the animals it depicts.
- West African lions still roamed the Ennedi massif around the guelta until they disappeared in the 1940s.
Why it is worth it
The Guelta d'Archei is a pool of dark water at the bottom of a narrow sandstone canyon in the Ennedi Plateau of northeastern Chad, deep in the Sahara. Gueltas are permanent desert waterholes, and this is the most famous of them: a winding cleft walled by sheer, wind-carved cliffs, sheltered enough from the sun that water survives here year round. From the rocks above, the view is of a long black pool reaching back into the gorge, with herds of camels standing knee-deep in it, small as toys beneath the cliffs.
The camels are the daily rhythm of the place. Herders drive their animals down into the canyon to drink and rest, and over the centuries the dung of countless camels has stained the water dark. Yet the guelta also shelters something far older: a tiny relict population of West African crocodiles, Crocodylus suchus, one of the last surviving groups in the Sahara. Their presence is a living memory of the wetter Middle Holocene, when, as fossil remains and the rock paintings of the region show, crocodiles lived across much of what is now desert. Only a handful remain, and estimates put the colony in single figures or around ten animals.
The surrounding Ennedi massif, inscribed as a UNESCO World Heritage site in 2016, is one of the most beautiful sandstone landscapes in Africa, a maze of arches, towers and canyons, with a wealth of rock paintings and engravings recording thousands of years of human life in the Sahara. The guelta is the green heart of that landscape, and arriving at its rim after days of open desert is the kind of moment that defines a journey.
Getting there
The guelta lies in the Ennedi Plateau southeast of Fada, a town about 38 km away. There are no paved roads in the region; the overland journey from N'Djamena, whose N'Djamena International Airport (NDJ) is the country's main gateway nearly 900 km away in a straight line, takes about four days by four-wheel-drive. Visits are normally made as part of organised desert expeditions with local drivers and guides.
On these lists
From the encyclopaedia
The Guelta d'Archei is one of the most famous gueltas in the Sahara. It is located in the Ennedi Plateau, in north-eastern Chad, south-east of the town of Fada. The Guelta d'Archei is inhabited by several kinds of animals, most notably the West African crocodile. Middle Holocene remains, as well as rock paintings, indicate that this species once thrived across most of today's Sahara Desert and in swamps and rivers along South Mediterranean shores. The small group of surviving crocodiles in the Guelta d'Archei represents one of the last colonies known in the Sahara today; the Tagant Plateau colony in Mauritania has likely been extinct since 1996.
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