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Djenné

Town in Mopti Region, Mali

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Through Portugal, UNESCO and Bamako

The history of Djenné is closely linked with that of Timbuktu. Between the 15th and 17th centuries much of the trans-Saharan trade in goods such as salt, gold, and slaves that moved in and out of Timbuktu passed through Djenné. Both towns became centres of Islamic scholarship. Djenné's prosperity depended on this trade and when the Portuguese established trading posts on the African coast, the importance of the trans-Saharan trade and thus of Djenné declined.

The town is famous for its distinctive adobe architecture, most notably the Great Mosque which was built in 1907 on the site of an earlier mosque. To the south of the town is Djenné-Djenno, the site of one of the oldest known towns in sub-Saharan Africa. It is one of the oldest cities in Mali and West Africa as well as oldest continuously inhabited cities in the World. Djenné together with Djenné-Djenno were designated a World Heritage Site by UNESCO in 1988.

Geography

Djenné is situated 398 km (247 mi) northeast of Bamako and 76 km (47 mi) southwest of Mopti. The town sits on the floodplain between the Niger and Bani rivers at the southern end of the Inland Niger Delta. The town has an area of around 70 ha (170 acres) and during the annual floods becomes an island that is accessed by causeways. The Bani river is 5 km (3.1 mi) south of the town and is crossed by ferry.

For administrative purposes the town forms part of the commune of Djenné which covers an area of 302 square kilometers and consists of the town and ten of the surrounding villages: Ballé, Diabolo, Gomnikouboye, Kamaraga, Kéra, Niala, Soala, Syn, Velingara and Yenleda. The population figures are for the commune and include these villages. The commune is bounded to the north by the communes of Ouro Ali and Derary, to the south by the commune of Dandougou Fakala, to the east by the communes of Fakala and Madiama and to the west by the commune of Pondori. The town is the administrative center (chef-lieu) of the Djenné Cercle, one of eight administrative subdivisions of the Mopti Region.

Climate

The weather is hot and dry throughout much of the year. Average daily maximum temperatures in the hottest months, April and May, are around 40 °C. Temperatures are slightly cooler, though still very hot, from June through September, when practically all of the annual rainfall occurs. Only the winter months of December and January have average daily maximum temperatures below 32 °C. Between December and March the warm dry north-easterly Harmattan wind blows from the Sahara. When it blows strongly, the dust-laden wind reduces visibility and creates a persistent haze. The annual rainfall is around 550 mm but varies greatly from year to year. August is normally the wettest month.

Annual flood

In Djenné the annual flood produced by Bani and Niger rivers begins in July and reaches a maximum in October. During this period, the town of Djenné becomes an island and the Souman-Bani channel that passes just to the east of the town fills and connects the Bani and Niger rivers. The year-to-year variation in the height of the flood leads to a large variation in the area of land that is flooded. This has important consequences for the local agriculture. The drought that began in the early 1970s resulted in a big reduction in the volume of water flowing in the Niger and Bani rivers. The effect on the Bani was particularly severe as the reduction in flow was much greater than the reduction in rainfall. The annual discharge of the river has not returned to the volumes experienced in the 1950s and 1960s. It is only during the flood season (mid-July till December) that the Bani river between Djenné and Mopti is easily navigable. At other times of the year, sandbars lie close to the water surface. When the French explorer René Caillié made the journey to Mopti in a small boat in March 1828, he was "obliged several times to unload the vessel in order to pass over sandbanks."

Talo dam

In 2006 the Talo Dam was constructed on the Bani River to irrigate parts of the floodplain near the town of San. The dam is located 43 km west of San and 110 km upstream from Djenné. The dam functions as a weir in that water can flow over the top of the retaining wall. The construction of the dam was highly controversial. The environmental impact assessment commissioned by the African Development Bank was criticised for not fully taking into account the hydrological impact downstream of the dam. The 0.18 km3 of water retained by the dam represents 1.3% of the average annual discharge of the river (the average for the period 1952–2002 is 13.4 km3). From the published information it is unclear how much of the total discharge will be diverted for irrigation and, of the diverted water, how much will drain back into the river. The downstream effect of the dam will be to delay the arrival of the annual flood and to reduce its intensity.

Djenné dam

In May 2009 the African Development Bank approved funding for an irrigation dam/weir to be built on the Bani near Soala, a village within the commune situated 12 km (7.5 mi) south of Djenné. The dam is one element in a 6-year 33.6 billion CFA franc (66 million USD) program that also includes the building of a dam on the Sankarani River near Kourouba and the extension of the area irrigated by the Talo dam. The proposed Djenné dam will retain 0.3 km3 of water, significantly more than the Talo dam. It will allow the "controlled flooding" of 14,000 ha (35,000 acres) of the Pondori floodplain (on the left bank of the river to the south of Djenné) to allow the cultivation of rice and the irrigation of an additional 5,000 ha (12,000 acres) for growing 'floating grass' (Echinochloa stagnina known locally as bourgou) for animal feed.

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