Chad: seven soldiers killed by a mine in a jihadist hideout area. Lake Chad is a vast expanse of water and swamps dotted with hundreds of islets.
Jihadists regularly attack the armies and civilians of the four neighboring countries. The Boko Haram insurgency emerged in 2009 in Nigeria - where it has left some 40,000 dead and more than two million displaced since then. ISWAP, which seceded from Boko Haram in 2016, still remains active in the region.