▁the ▁west ▁of ▁the ▁N ore ▁Valley ▁with ▁Castle com er ▁Hills ▁and ▁Sl ieve ▁Mar cy ▁to ▁the ▁east . ▁These ▁hills ▁are ▁divided ▁by ▁the ▁valley ▁of ▁the ▁Din an ▁river ▁which ▁joins ▁the ▁N ore ▁from ▁the ▁east . ▁The ▁highest ▁point ▁of ▁the ▁Castle com er ▁Hills ▁is ▁, ▁and ▁located ▁North - West ▁of ▁the ▁town ▁of ▁Castle com er ▁and ▁near ▁the ▁border ▁with ▁La ois . ▁The ▁highest ▁point ▁of ▁the ▁C ulla ▁Hills ▁is ▁in ▁La ois ▁at ▁, ▁but ▁its ▁und ulating ▁s lop es ▁spread ▁over ▁a ▁considerable ▁area ▁of ▁Kil ken ny ▁in ▁the ▁north - w ester ly ▁area . ▁ ▁In ▁the ▁west ▁of ▁the ▁county ▁the ▁Sl ieve ard agh ▁Hills ▁and ▁Bo ole y ▁Hills ▁extend ▁west wards ▁to ▁County ▁Ti pper ary . ▁The ▁highest ▁point ▁in ▁the ▁Sl ieve ard agh ▁Hills ▁is ▁Kno ck nam uck ▁at ▁. ▁The ▁Bo ole y ▁Mountains ▁partly ▁divide ▁from ▁T ory ▁Hill ▁to ▁the ▁valley ▁of ▁the ▁Kil mac ow ▁River ▁which ▁flows ▁into ▁the ▁Su ir . ▁ ▁In ▁the ▁south ▁of ▁the ▁county ▁is ▁Br andon ▁Hill , ▁at ▁ ▁and ▁is ▁near ▁the ▁Bar row ▁and ▁Gra ig uen aman agh . ▁The ▁area ▁en closed ▁between ▁the ▁rivers ▁N ore ▁and ▁Bar row ▁towards ▁their ▁point ▁of ▁joining ▁is ▁elev ated . ▁Al ong ▁the ▁west ▁of ▁the ▁Bar row ▁and ▁N ore ▁is ▁mostly ▁covered ▁by ▁hills ▁of ▁nearly ▁equal ▁elev ation ▁except