Rivers are lifelines in many dry regions of Africa. They provide the necessary water for agriculture, household uses, transport, and biodiversity. They fill the wetlands of inland and coastal deltas with fresh water, thereby maintaining the inhabitant’s livelihoods and biodiversity of these dynamic areas
I’m pretty sure it’s for their horns?
I know jobs for one, over population maybe, and because they are worried that dangerous people could be entering into the country with intention to harm. (unless this is a "only 3 right answer" kind of thing)