▁some ▁ igne ous ▁intr us ions . ▁The ▁site ▁ranges ▁in ▁alt itude ▁from ▁ 1 , 6 4 5 ▁m ▁in ▁the ▁bed ▁of ▁the ▁O ued ▁Ar hed d ou ▁to ▁ 3 , 1 0 2 ▁m ▁at ▁the ▁sum mit ▁of ▁J bel ▁Tan rh ourt . ▁At ▁its ▁western ▁end ▁it ▁includes ▁the ▁tw in ▁la kes ▁of ▁Is li ▁and ▁T isl it , ▁near ▁Im il ch il . ▁The ▁northern ▁s lop es ▁enjoy ▁an ▁annual ▁precip itation ▁of ▁ 4 0 0 – 6 0 0   mm , ▁and ▁are ▁consequ ently ▁well - wood ed , ▁while ▁the ▁southern ▁s lop es ▁are ▁d rier , ▁receiving ▁only ▁ 2 0 0 – 3 0 0   mm , ▁and ▁are ▁more ▁open . ▁Winter ▁sn ows ▁are ▁abund ant ▁and ▁long - last ing ▁at ▁the ▁higher ▁elev ations . ▁On ▁the ▁northern ▁side , ▁wo ody ▁veget ation ▁consists ▁of ▁dense ▁ced ar ▁( C ed rus ▁at lant ica ) ▁and ▁p ine ▁( P inus ▁pin aster ▁mag h reb iana ) ▁for ests , ▁o ak ▁( Qu erc us ▁rot und ifolia ) ▁wood land , ▁open ▁Juni per us ▁th ur if era ▁wood land ▁and , ▁at ▁lower ▁alt itudes , ▁some ▁P inus ▁ha le p ensis . ▁The ▁mountain ▁summ its ▁and ▁high ▁plate aus ▁support ▁x er oph yt ic ▁ste ppe ▁veget ation , ▁and ▁there ▁is ▁some ▁grass