I'm pretty sure it's Madagascar, because Alergia and Chad are both deserts in Sahara, and Madagascar isn't even on Africa its off the southeast of Africa so I hope this helped!
As the debris is geologically event with the water-laden masses of soils and rocks fragments and fall down from the mountains and a funnel into the stream channels and also, objects there paths with thick mud and blocks valleys. The volume if the debris flows generally ranged from the 100,000 cubic meters and frequent n the mountainous regions and can be very destructive.
