2 5 ▁km ▁east ▁of ▁Al gi ers . ▁According ▁to ▁the ▁ 2 0 0 8 ▁census , ▁this ▁town ▁has ▁a ▁population ▁of ▁ 2 0 , 7 0 5 . ▁ ▁Local ities ▁ ▁The ▁municipality ▁is ▁composed ▁of ▁two ▁main ▁cities , ▁the ▁city ▁of ▁Cor so ▁( ch ief ▁town ), ▁and ▁the ▁ag gl omer ation ▁of ▁Ber ra hm ou ne ▁and ▁several ▁secondary ▁ag gl omer ations ▁like ▁T ray k ia , ▁Ha ouch ▁Mah f oud ▁Ben ▁Ab del k ader , ▁and ▁O u led ▁Ben ▁Bak ht a . ▁ ▁Arch ae ology ▁▁ ▁The ▁wil aya ▁of ▁Bou mer d ès ▁represents ▁an ▁arch ae ological ▁tre asure ▁thanks ▁to ▁the ▁mult itude ▁of ▁the ▁historical ▁sites ▁which ▁sh el ters ▁its ▁vast ▁area ▁of ▁ 1 , 4 5 6 . 1 6 ▁km ². ▁ ▁Several ▁cent ers ▁of ▁population ▁were ▁built ▁during ▁more ▁than ▁ 2 0 ▁centuries ▁on ▁these ▁medium ▁alt itude ▁grounds ▁that ▁form ▁the ▁current ▁Lower ▁Kab yl ie ▁whose ▁city ▁of ▁Bou mer d ès ▁is ▁the ▁current ▁chief ▁town . ▁ ▁The ▁ma us ole um ▁of ▁Bl ad ▁Gu it oun ▁in ▁the ▁commune ▁of ▁Si ▁Must ap ha ▁is ▁an ▁example ▁of ▁the ▁arch ae ological ▁sites ▁that ▁were ▁still ▁visible ▁in ▁Lower ▁Kab yl ia ▁at ▁the ▁beginning ▁of ▁the ▁French ▁colon ization ▁in ▁ 1 8 3 7 . ▁ ▁The ▁B én ian ▁N TA A ▁Sou