▁The ▁hill ▁range ▁runs ▁from ▁roughly ▁in ▁a ▁line ▁from ▁M ob ara ▁or ▁ Ō am ish iras ato ▁to ▁K is ar azu , ▁but ▁is ▁not ▁formally ▁defined . ▁It ▁is ▁an ▁important ▁part ▁of ▁the ▁Min ami ▁B ō s ō ▁Qu asi - National ▁Park . ▁ ▁Geography ▁▁ ▁The ▁B ō s ō ▁Hill ▁Range ▁is ▁still ▁extens ively ▁wood ed . ▁The ▁area ▁from ▁the ▁Y ō r ō ▁Rav ine ▁to ▁Mount ▁Se ich ō ▁is ▁noted ▁for ▁its ▁for ests ▁of ▁live ▁o ak . ▁The ▁hill ▁range ▁also ▁has ▁noted ▁for ests ▁of ▁o aks , ▁ch est nut , ▁Japanese ▁ced ar ▁( C rypt om eria ), ▁and ▁various ▁species ▁of ▁ever green . ▁The ▁hill ▁area ▁around ▁T ate y ama ▁is ▁noted ▁for ▁its ▁for ests ▁of ▁cast an opsis ▁trees , ▁a ▁genus ▁of ▁ever gre ens ▁belonging ▁to ▁the ▁be ech ▁family . ▁ ▁History ▁ ▁Pre mod ern ▁history ▁▁ ▁The ▁B ō s ō ▁Hill ▁Range ▁was ▁settled ▁from ▁the ▁earliest ▁periods ▁of ▁Japanese ▁history . ▁The ▁Y ō r ō ▁Rav ine ▁in ▁present - day ▁ Ō t aki , ▁Ch iba ▁is ▁home ▁to ▁J ō mon ▁period ▁remains . ▁K of un ▁tum uli ▁were ▁built ▁across ▁the ▁entire ▁hill ▁range ▁in ▁the ▁K of un ▁period , ▁but ▁Fut ts u ▁and ▁I chi h ara ▁have ▁especially ▁rich ▁examples ▁of ▁tum uli . ▁Under ▁the ▁Ta ika ▁Reform ▁of