ship ▁of ▁Sierra ▁Fernández . ▁ ▁The ▁San ▁Lorenzo ▁range ▁is ▁known ▁for ▁its ▁high ▁pe aks , ▁such ▁as ▁the ▁San ▁Is id ro ▁peak , ▁which ▁serves ▁as ▁a ▁but tr ess ▁in ▁this ▁chain ▁of ▁the ▁mountains . ▁The ▁Vel arde ña ▁valley ▁and ▁its ▁rich ▁min eral ▁mines ▁serve ▁as ▁the ▁town ▁limit ▁for ▁the ▁village ▁of ▁the ▁same ▁name . ▁In ▁the ▁n ort he astern ▁part ▁of ▁the ▁town , ▁a ▁little ▁beyond ▁the ▁San ▁Lorenzo ▁mountains , ▁up ▁the ▁ste ep ▁and ▁rug ged ▁Sierra ▁de ▁Gu ad alu pe ▁that ▁runs ▁parallel ▁to ▁the ▁Sierra ▁de ▁Jim ul co , ▁in ▁the ▁Municip ality ▁of ▁Simon ▁Boliv ar ▁and ▁the ▁Co ahu ila ▁State , ▁the ▁two ▁mountain ▁ranges ▁of ▁Gu ad alu pe ▁and ▁Jim ul co ▁form ▁a ▁more ▁or ▁less ▁wide ▁can y on ▁where ▁the ▁Agu an aval ▁river ▁and ▁the ▁Central ▁rail road ▁run . ▁This ▁can y on ▁is ▁known ▁as ▁the ▁" J im ul co ▁C any on ." ▁ ▁The ▁Agu an aval ▁River ▁flows ▁into ▁the ▁Naz as ▁River , ▁which ▁is ▁the ▁main ▁river ▁in ▁this ▁area . ▁The ▁surrounding ▁area ▁of ▁these ▁mountains ▁is ▁ar id ▁and ▁the ▁C ret ace ous ▁form ations ▁of ▁the ▁pl ates ▁and ▁layers ▁of ▁the ▁ground ▁are ▁visible . ▁ ▁R ivers , ▁la kes , ▁and ▁spr ings ▁The ▁main ▁river ▁in ▁this ▁area ▁is ▁the ▁C uen cam é ▁stream . ▁All ▁of ▁the