▁of ▁the ▁Ch ad ▁plain , ▁occup ies ▁the ▁sout he astern ▁third ▁of ▁the ▁province . ▁It ▁is ▁not ▁as ▁pr one ▁to ▁flo oding ▁due ▁to ▁a ▁number ▁of ▁ins el berg s ▁through ▁the ▁area . ▁ ▁The ▁province ▁is ▁also ▁home ▁to ▁a ▁number ▁of ▁la kes . ▁The ▁most ▁prominent ▁of ▁these ▁is ▁Lake ▁Ch ad . ▁The ▁lake ▁was ▁formed ▁by ▁a ▁t ect onic ▁de pression ▁that ▁has ▁since ▁been ▁filled ▁in ▁by ▁the ▁area ' s ▁rivers . ▁However , ▁over ▁time , ▁these ▁rivers ▁have ▁depos ited ▁sed iment ▁as ▁well , ▁making ▁Lake ▁Ch ad ▁nearly ▁disappear ▁in ▁the ▁past . ▁This ▁is ▁a ▁cause ▁of ▁concern , ▁since ▁when ▁the ▁Log one ▁and ▁May o ▁K é bi ▁flo od , ▁they ▁meet . ▁This ▁diver ts ▁water ▁from ▁the ▁Log one ▁to ▁the ▁K é bi , ▁and ▁ultimately ▁the ▁B én ou é . ▁This ▁has ▁caused ▁some ▁scient ists ▁to ▁predict ▁that ▁in ▁the ▁future , ▁river ▁capture ▁will ▁occur , ▁dep riv ing ▁Lake ▁Ch ad ▁of ▁one ▁of ▁its ▁major ▁sources . ▁Much ▁of ▁Lake ▁Ch ad ▁ev apor ates ▁each ▁year ▁and ▁must ▁be ▁replaced ▁by ▁ra ins ▁from ▁the ▁wet ▁season . ▁ ▁Other ▁la kes ▁include ▁Lake ▁F i anga , ▁which ▁exists ▁only ▁during ▁the ▁season al ▁flo oding ▁of ▁the ▁Log one ; ▁during ▁the ▁dry ▁season , ▁it ▁is ▁at ▁best ▁a ▁ ▁sw amp . ▁Mag a ▁Lake , ▁south