▁is ▁covered ▁by ▁all uv ial ▁de br is ▁formed ▁when ▁the ▁mountains ▁er oded . ▁An ▁occas ional ▁r idge ▁projects ▁through ▁the ▁all uv ial ▁cover ▁to ▁interrupt ▁the ▁monot ony ▁of ▁the ▁landscape . ▁ ▁Water ▁collect s ▁during ▁the ▁wet ▁season ▁on ▁its ▁level ▁terrain , ▁forming ▁large ▁shall ow ▁salt ▁la kes ▁which ▁become ▁salt ▁fl ats ▁as ▁they ▁dry . ▁The ▁largest ▁of ▁such ▁la kes ▁is ▁the ▁Ch ott ▁E ch ▁Ch erg ui ▁with ▁a ▁length ▁of ▁about ▁ 1 6 0   km ▁located ▁in ▁the ▁central ▁section ▁of ▁the ▁pla ins . ▁The ▁H od na ▁region , ▁with ▁the ▁Ch ott ▁el ▁H od na ▁lies ▁at ▁the ▁eastern ▁end ▁of ▁the ▁Haut es ▁Pla ines . ▁ ▁The ▁main ▁towns ▁of ▁the ▁plate au ▁are ▁B ord j ▁Bou ▁Ar rer id j , ▁S ét if , ▁T ia ret , ▁Dj elf a ▁and ▁M ' s ila . ▁The ▁limits ▁of ▁the ▁pla ins ▁are ▁not ▁clearly ▁defined , ▁but ▁administr atively ▁the ▁territory ▁falls ▁within ▁the ▁following ▁Al ger ian ▁provinces : ▁▁ ▁Eastern ▁part : ▁The ▁plate au ▁on ▁this ▁side ▁falls ▁within ▁the ▁provinces ▁of ▁S ét if , ▁B ord j ▁Bou ▁Ar rer id j , ▁Bat na , ▁K hen ch ela , ▁T éb essa ▁and ▁O um ▁El ▁Bou ag hi . ▁ ▁Central ▁part : ▁Dj elf a , ▁Lag hou at , ▁M ’ S ila ▁and ▁T