▁Roman ▁Catholic ▁parish ▁of ▁Cor l ough ▁and ▁bar ony ▁of ▁Tul ly h aw . ▁ ▁Geography ▁ ▁Alt c rock ▁is ▁bounded ▁on ▁the ▁north ▁by ▁Alt ates kin ▁town land , ▁on ▁the ▁west ▁by ▁Der ry nan anta ▁Lower ▁and ▁G ow lan ▁town lands ▁and ▁on ▁the ▁east ▁by ▁O w enc am ▁town land . ▁Its ▁chief ▁ge ographical ▁features ▁are ▁M ull agh roe ▁mountain , ▁a ▁small ▁mountain ▁lake , ▁the ▁O w ens all agh ▁river ▁( A ▁source ▁of ▁the ▁River ▁Black water , ▁County ▁Cav an ), ▁a ▁mountain ▁stream , ▁water falls , ▁forest ry ▁plant ations , ▁gra vel ▁p its , ▁a ▁spring ▁and ▁d ug ▁well s . ▁Alt c rock ▁is ▁travers ed ▁by ▁the ▁L 1 0 1 9 ▁public ▁road ▁and ▁rural ▁lan es . ▁The ▁town land ▁covers ▁ 5 6 9 ▁stat ute ▁acres . ▁There ▁are ▁several ▁sub - div isions ▁in ▁the ▁town land , ▁including ▁B enn ▁Alt c rock ▁( The ▁Pe ak ▁of ▁Alt c rock ); ▁The ▁White ▁House , ▁a ▁spring ▁well ▁where ▁the ▁gent ry ▁used ▁to ▁l unch ▁when ▁on ▁shooting - part ies . ▁There ▁was ▁probably ▁a ▁hunting - l odge ▁here ; ▁Pe ec en na con sp ud ge ▁( P ios a ▁na ▁Cons p ó ide ▁= ▁The ▁Sp ot ▁of ▁the ▁Dis put e ). ▁Ex c ise ▁and ▁Re venue ▁men ▁used ▁to ▁sink ▁the ▁illegal