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Gao

Urban commune and town in Gao Region, Mali

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Tomb of Askia , Gao
David Sessoms from Fribourg, Switzerland · CC BY-SA 2.0

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Through Bamako and Prime meridian

For much of its history, Gao was an important commercial centre involved in the trans-Saharan trade. In the 9th century external Arabic writers described Gao as an important regional power, and by the end of the 10th century, the local ruler was said to be a Muslim. Towards the end of the 13th century, Gao became part of the Mali Empire.

In the first half of the 15th century the town regained its independence. With the conquests of Sunni Ali (ruled 1464–1492) it became the capital of the Songhai Empire. The Empire collapsed after the Moroccan invasion in 1591, and the invaders chose to make Timbuktu their capital.

By the time of Heinrich Barth's visit in 1854, Gao had declined to become an impoverished village with 300 huts constructed from matting. In 2009, the urban commune had a population of 86,633.

In 2012, Gao was captured from Malian government forces by National Movement for the Liberation of Azawad (MNLA) and Ansar Dine rebels. After additional captures of Kidal and Timbuktu, the MNLA declared the region independent of Mali as the nation of Azawad and named Gao its capital. The MNLA lost control to Islamist militias after the Battle of Gao in June 2012, with the city being recaptured by French military forces as part of Opération Serval in early 2013.

Geography

Location

Gao is located on the eastern bank of the Niger River at the junction with the Tilemsi Valley. The sprawling town is the largest in eastern Mali. It is connected to the capital, Bamako at the western end of Mali, by 1200 km (750 mi) of paved road. In 2006, the Wabaria bridge was opened to replace the ferry service across the Niger. The bridge was constructed by the China State Construction Engineering Corporation and financed by the Islamic Development Bank and the Malian government.

The town is located with road links (unpaved) to the desert Kidal Region to the north and to Niamey, the capital of Niger, to the south. The road to the south runs along the left bank of the river. The town of Ansongo is 103 km (65 mi) from Gao. The border with Niger is just south of the village of Labbézanga, a distance of 204 km (127 mi). The prime meridian marker runs right through Gao, Mali.

There are also seasonal ferry services on the Niger River. A service between Gao and Koulikoro, a distance of 1380 km (860 mi), is managed by the Compagnie Malienne de Navigation (COMANAV). It usually operates from the end of July, after the annual rains when there is sufficient water in the river, until mid November. Smaller boats are able to operate for a longer season between Bourem and Ansongo.

In the 1998 census, the population of the urban commune was 52,201. By the census in 2009 this had increased to 86,633, a 4.7% annual growth rate. For administrative purposes, the commune is divided into nine quartiers: Gadeye, Farandjiré, Aljanabanbia, Djoulabougou, Saneye, Sosso Koïra, Boulgoundjé, Château, and Djidara. The urban commune is bounded to the north by the commune of Soni Ali Ber, to the east by the commune of Anchawadi and to the south and west by the commune of Gounzoureye.

Climate

Gao features an arid climate (BWh) under Köppen's climate classification. Gao's climate is hot and dry, with the only rainfall occurring between June and September. August is normally the wettest month. The average annual rainfall is only 220 mm, but there are large year-to-year variations. May is the hottest month, with an average daily high temperature of 43 °C. December and January are the coolest months, with daily low temperatures of 15 °C. From October to March during the dry period, the north-easterly Harmattan wind blows from the Sahara.

With the low rainfall, the vegetation further away from the river is sparse and consists mainly of various species of Acacia (Acacia raddiana, Acacia nilotica, Acacia ehrenbergiana) and Balanites aegyptiaca. The herbaceous plants are dominated by Cenchrus biflorus and Panicum laetum.

Annual flood of the Niger River

Almost all the local agriculture depends on river water for irrigation. The annual flood of the Niger River is a result of the heavy rainfall in the headwaters of the Niger and Bani rivers in Guinea and the northern Ivory Coast. The rainfall in the headwater areas peaks in August but the flood water takes time to pass down the river system, through the Inner Niger Delta region and arrive at Gao. At Koulikoro the flood peaks in September, while in Gao the flood lasts longer and reaches a maximum in December. There is a large year-to-year variation in the extent of the flooding. The existing and proposed dams upstream of Gao reduce the overall flow of the river and could potentially have a large effect on the local agriculture. When in flood the river is 4 km wide at Gao but during the dry season a number of islands appear in the river. There is very little flow, only 5% of the maximum, in June and July.

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Source and licence. Adapted from the Wikipedia article “Gao” (this version, 2026-10-02) by its contributors, shared under CC BY-SA 4.0. Lablypedia has left out its tables, references and most pictures, and linked it to other Lablypedia articles.