Trans-Saharan trade requires travel across the Sahara (north and south) to reach sub-Saharan Africa from the North African coast, Europe, to the Levant. While existing from prehistoric times, the peak of trade extended from the 8th century until the early 17th century.
The Sahara once had a very different environment. In Libya and Algeria, from at least 7000 BC, there was pastoralism, herding of sheep and goats, large settlements and pottery. Cattle were introduced to the Central Sahara (Ahaggar) from 4000 to 3500 BC. Remarkable rock paintings (dated 3500 to 2500 BC), in places which are currently very dry, portray vegetation and animal presence rather different from modern expectations.
As a desert, Sahara is now a hostile expanse that separates the Mediterranean economy from the economy of the Niger basin. As Fernand Braudel points out that crossing such a zone (especially without mechanized transport) is worthwhile only when exceptional circumstances cause the expected gain to outweigh the cost and danger.
Trade, beginning around 300 CE, was conducted by caravans of camels. According to Ibn Battuta, the explorer who accompanied one of the caravans, the average size per caravan was 1,000 camels; some caravans were as large as 12,000. The caravans would be guided by highly paid Berbers who knew the desert and could ensure safe passage from their fellow desert nomads. The survival of a caravan was precarious and would rely on careful coordination. Runners would be sent ahead to oases so that water could be shipped out to the caravan when it was still several days away, as the caravans could not easily carry enough with them to make the full journey. In the middle of the 14th century Ibn Battuta crossed the desert from Sijilmasa via the salt mines at Taghaza to the oasis of Oualata. A guide was sent ahead and water was brought on a journey of four days from Oualata to meet the caravan. Culture and religion were also exchanged on the Trans-Saharan Trade Route. These colonies eventually adopted the language and region of the country and became absorbed into the Muslim population.  These colonies that were being discussed in E.W. Bovill's book were Christian captives who were brought to Africa as slaves and eventually they converted to Islam and became part of the Muslim population. Like some other people in Africa, there were some benefits of becoming part of the Muslim population. During the Muslim control of some of the Western African nations during this time there was a non-Muslim tax and many people converted so they would not have to pay that tax and also for the Christian slaves, it is against the Islamic religion to have slaves so it was one way to gain their freedom.
Ancient trade spanned the northeastern corner of the Sahara in the Naqadan era. Predynastic Egyptians in the Naqada I period traded with Nubia to the south, the oases of the Western Desert to the west, and the cultures of the eastern Mediterranean to the east. Many trading routes went from oasis to oasis to resupply on both food and water. These oases were very important. They also imported obsidian from Ethiopia to shape blades and other objects.
The overland route through the Wadi Hammamat from the Nile to the Red Sea was known as early as predynastic times; drawings depicting Egyptian reed boats have been found along the path dating to 4000 BC. Ancient cities dating to the First Dynasty of Egypt arose along both its Nile and Red Sea junctions, testifying to the route's ancient popularity. It became a major route from Thebes to the Red Sea port of Elim, where travelers then moved on to either Asia, Arabia or the Horn of Africa. Records exist documenting knowledge of the route among Senusret I, Seti, Ramesses IV and also, later, the Roman Empire, especially for mining.
The Darb el-Arbain trade route, passing through Kharga in the south and Asyut in the north, was used from as early as the Old Kingdom for the transport and trade of gold, ivory, spices, wheat, animals and plants. Later, Ancient Romans would protect the route by lining it with varied forts and small outposts, some guarding large settlements complete with cultivation. Described by Herodotus as a road "traversed ... in forty days", it became by his time an important land route facilitating trade between Nubia and Egypt, and subsequently became known as the Forty Days Road. From Kobbei, 40 kilometres (25 mi) north of al-Fashir, the route passed through the desert to Bir Natrum, another oasis and salt mine, to Wadi Howar before proceeding to Egypt. The Darb el-Arbain trade route was the easternmost of the central routes.
The westernmost of the three central routes was the Ghadames Road, which ran from the Niger River at Gao north to Ghat and Ghadames before terminating at Tripoli. Next was the easiest of the three routes: the Garamantean Road, named after the former rulers of the land it passed through and also called the Bilma Trail. The Garamantean Road passed south of the desert near Murzuk before turning north to pass between the Alhaggar and Tibesti Mountains before reaching the oasis at Kawar. From Kawar, caravans would pass over the great sand dunes of Bilma, where rock salt was mined in great quantities for trade, before reaching the savanna north of Lake Chad. This was the shortest of the routes, and the primary exchanges were slaves and ivory from the south for salt.
The western routes were the Walata Road, from the Sénégal River, and the Taghaza Trail, from the Mali River, which had their northern termini at the great trading center of Sijilmasa, situated in Morocco just north of the desert. The growth of the city of Aoudaghost, founded in the 5th century BCE, was stimulated by its position at the southern end of a trans Saharan trade route.
To the east, three ancient routes connected the south to the Mediterranean. The herdsmen of the Fezzan of Libya, known as the Garamantes, controlled these routes as early as 1500 BC. From their capital of Germa in the Wadi Ajal, the Garamantean Empire raided north to the sea and south into the Sahel. By the 4th century BC, the independent city-states of Phoenecia had expanded their control to the territory and routes once held by the Garamantes. Shillington states that existing contact with the Mediterranean received added incentive with the growth of the port city of Carthage. Founded c. 800 BCE, Carthage became one terminus for West African gold, ivory, and slaves. West Africa received salt, cloth, beads, and metal goods. Shillington proceeds to identify this trade route as the source for West African iron smelting. Trade continued into Roman times. Although there are Classical references to direct travel from the Mediterranean to West Africa (Daniels, p. 22f), most of this trade was conducted through middlemen, inhabiting the area and aware of passages through the drying lands. The Legio III Augusta subsequently secured these routes on behalf of Rome by the 1st century AD, safeguarding the southern border of the empire for two and half centuries.
Herodotus had spoken of the Garamantes hunting the Ethiopian Troglodytes with their chariots; this account was associated with depictions of horses drawing chariots in contemporary cave art in southern Morocco and the Fezzan, giving origin to a theory that the Garamantes, or some other Saran people, had created chariot routes to provide Rome and Carthage with gold and ivory. However, it has been argued that no horse skeletons have been found dating from this early period in the region, and chariots would have been unlikely vehicles for trading purposes due to their small capacity.
The earliest evidence for domesticated camels in the region dates from the 3rd century. Used by the Berber people, they enabled more regular contact across the entire width of the Sahara, but regular trade routes did not develop until the beginnings of the Islamic conversion of West Africa in the 7th and 8th centuries. Two main trade routes developed. The first ran through the western desert from modern Morocco to the Niger Bend, the second from modern Tunisia to the Lake Chad area. These stretches were relatively short and had the essential network of occasional oases that established the routing as inexorably as pins in a map. Further east of the Fezzan with its trade route through the valley of Kaouar to Lake Chad, Libya was impassable due to its lack of oases and fierce sandstorms. A route from the Niger Bend to Egypt was abandoned in the 10th century due to its dangers.
The rise of the Ghana Empire, now called Mali, Senegal, and southern Mauritania, paralleled the increase in trans-Saharan trade. Mediterranean economies were short of gold but could supply salt, taken by places like the African salt mine of Taghaza, whereas West African countries like Wangara had plenty of gold but needed salt. The trans-Saharan slave trade was also important because large numbers of Africans were sent north, generally to serve as domestic servants or slave concubines. The West African states imported highly trained slave soldiers. It has been estimated that from the 10th to the 19th century some 6,000 to 7,000 slaves were transported north each year. Perhaps as many as nine million slaves were exported along the trans-Saharan caravan route. Several trade routes became established, perhaps the most important terminating in Sijilmasa (Morocco) and Ifriqiya to the north. There, and in other North African cities, Berber traders had increased contact with Islam, encouraging conversions, and by the 8th century, Muslims were traveling to Ghana. Many in Ghana converted to Islam, and it is likely that the Empire's trade was privileged as a result. Around 1050, Ghana lost Aoudaghost to the Almoravids, but new goldmines around Bure reduced trade through the city, instead benefiting the Malinke of the south, who later founded the Mali Empire.
Unlike Ghana, Mali was a Muslim kingdom since his foundation, and under it, the gold-salt trade continued. Other, less important trade goods were slaves, kola nuts from the south and slave beads and cowry shells from the north (for use as currency). It was under Mali that the great cities of the Niger bend--including Gao and Djenné--prospered, with Timbuktu in particular becoming known across Europe for its great wealth. Important trading centers in southern West Africa developed at the transitional zone between the forest and the savanna; examples include Begho and Bono Manso (in present-day Ghana) and Bondoukou (in present-day Côte d'Ivoire). Western trade routes continued to be important, with Ouadane, Oualata and Chinguetti being the major trade centres in what is now Mauritania, while the Tuareg towns of Assodé and later Agadez grew around a more easterly route in what is now Niger.
The eastern trans-Saharan route led to the development of the long lived Kanem-Bornu empire as well as the Ghana, Mali, and Songhai empires,centred on the Lake Chad area. This trade route was somewhat less efficient and only rose to great prominence when there was turmoil in the west such as during the Almohad conquests.
The Portuguese journeys around the West African coast opened up new avenues for trade between Europe and West Africa. By the early 16th century, European trading bases, the "Factories" established on the coast since 1445, and trade with the wealthier Europeans became of prime importance to West Africa. North Africa had declined in both political and economic importance, while the Saharan crossing remained long and treacherous. However, the major blow to trans-Saharan trade was the Battle of Tondibi of 1591-92. Morocco sent troops across the Sahara and attacked Timbuktu, Gao and some other important trading centres, destroying buildings and property and exiling prominent citizens. This disruption to trade led to a dramatic decline in the importance of these cities and the resulting animosity reduced trade considerably.
Although much reduced, trans-Saharan trade continued. But trade routes to the West African coast became increasingly easy, particularly after the French invasion of the Sahel in the 1890s and subsequent construction of railways to the interior. A railway line from Dakar to Algiers via the Niger bend was planned but never constructed. With the independence of nations in the region in the 1960s, the north-south routes were severed by national boundaries. National governments were hostile to Tuareg nationalism and so made few efforts to maintain or support trans-Saharan trade, and the Tuareg Rebellion of the 1990s and Algerian Civil War further disrupted routes, with many roads closed.
Traditional caravan routes are largely void of camels, but the shorter Azalai routes from Agadez to Bilma and Timbuktu to Taoudenni are still regularly--if lightly--used. Some members of the Tuareg still use the traditional trade routes, often traveling 2,400 km (1,500 mi) and six months out of every year by camel across the Sahara trading in salt carried from the desert interior to communities on the desert edges.
The African Union and African Development Bank support the Trans-Sahara Highway from Algiers to Lagos via Tamanrasset which aims to stimulate trans-Saharan trade. The route is paved except for a 200 km section in northern Niger, but border restrictions still hamper traffic. Only a few trucks carry trans-Saharan trade, particularly fuel and salt. Three other highways across the Sahara are proposed: for further details see Trans-African Highways. Building the highways is difficult because of sandstorms
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