▁park ▁in ▁Western ▁Australia , ▁ 4 7   kil omet res ▁n ortheast ▁of ▁Per th . ▁It ▁was ▁named ▁after ▁the ▁Av on ▁River ▁which ▁flows ▁through ▁it . ▁The ▁area ▁is ▁an ▁und ulating ▁plate au ▁with ▁the ▁sides ▁of ▁the ▁valley ▁ste ep ly ▁s lop ing ▁back ▁to ▁the ▁river ▁approximately ▁ ▁below . ▁The ▁area ▁contains ▁gran ite ▁out cro ps ▁and ▁a ▁mix ▁of ▁soil ▁types ▁including ▁lo ams , ▁gra vel s ▁and ▁later it ic ▁s ands . ▁ ▁It ▁was ▁officially ▁named ▁on ▁ 1 5 ▁October ▁ 1 9 7 1 . ▁ ▁Jar rah , ▁Mar ri ▁and ▁W ando o ▁trees ▁are ▁found ▁in ▁the ▁park ▁along ▁with ▁ 9 0 ▁different ▁species ▁of ▁birds ▁making ▁it ▁an ▁ideal ▁place ▁for ▁bird ▁watching . ▁Christmas ▁trees ▁and ▁gr as st rees ▁are ▁inter sp ers ed ▁through ▁the ▁wood lands . ▁ ▁In ▁the ▁spring time ▁the ▁park ▁is ▁visited ▁by ▁wild flow er ▁enthus iast s ▁to ▁view ▁the ▁a ▁diverse ▁range ▁of ▁flowers ▁including ▁dry and ras , ▁don key ▁orch ids ▁and ▁le chen ault ias . ▁Other ▁plants ▁found ▁in ▁the ▁area ▁are ▁Con ost yl is ▁and ▁the ▁rare ▁fr ing ed ▁l ily ▁are ▁also ▁found ▁within ▁the ▁park . ▁ ▁The ▁bus hr anger ▁Mo ond y ne ▁Joe ▁used ▁the ▁area ▁as ▁a ▁hide - out ▁with ▁his ▁cave ▁and ▁cor ral ▁situated ▁within ▁the ▁park ▁boundaries . ▁Both ▁have ▁since ▁been