• The Sahel is the ecoclimatic and biogeographic realm of transition in Africa between the Sahara to the north and the Sudanian savanna to the south.
• Having a semi-arid climate, it stretches across the south-central latitudes of Northern Africa between the Atlantic Ocean and the Red Sea.

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• Historically, the western part of the Sahel was sometimes known as the Sudan region .
• This belt was roughly located between the Sahara and the coastal areas of West Africa.
• Terrorist organizations including Boko Haram and Al-Qaeda in the Islamic Maghreb (AQIM) operating in the Sahel have contributed to the violence, extremism and          instability of the region
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