▁the ▁province . ▁ ▁In ▁June ▁ 2 0 0 6 , ▁the ▁only ▁com unes ▁with ▁a ▁population ▁over ▁ 1 0 , 0 0 0 ▁were ▁T erni , ▁Or vi eto , ▁Nar ni ▁and ▁Am elia . ▁ ▁Geography ▁ ▁It ▁is ▁border ed ▁to ▁the ▁north ▁with ▁the ▁Province ▁of ▁Per ug ia , ▁to ▁the ▁east , ▁south ▁and ▁west ▁with ▁the ▁Laz io ▁( Pro v ince ▁of ▁R iet i ▁and ▁Province ▁of ▁V iter bo ) ▁and ▁to ▁north - west ▁with ▁the ▁T usc any ▁( Pro v ince ▁of ▁S ien a ). ▁The ▁province ▁extends ▁into ▁the ▁south - west ▁of ▁the ▁Um b ria ▁region , ▁occup ying ▁the ▁last ▁section ▁of ▁the ▁N era ▁River ▁valley ▁near ▁the ▁confl u ence ▁with ▁the ▁Vel ino ▁River , ▁and ▁the ▁eastern ▁part ▁of ▁the ▁valley ▁of ▁the ▁T iber ▁River . ▁ ▁The ▁province ▁of ▁T erni ▁is ▁character ized ▁by ▁its ▁s lop es ▁encountered ▁along ▁the ▁path ▁of ▁rivers , ▁allowing ▁the ▁explo itation ▁of ▁hydro ▁catch ment ▁areas , ▁so ▁as ▁to ▁have ▁led ▁to ▁the ▁creation ▁of ▁several ▁artificial ▁la kes : ▁▁ ▁Lake ▁Cor bara ▁ ▁Lake ▁Al v iano ▁ ▁Lake ▁Rec ent ino ▁ ▁Lake ▁San ▁Liber ato ▁ ▁Lake ▁Are z zo ▁ ▁Lake ▁P ied il u co ▁ ▁History ▁ ▁In ▁the ▁ 2 nd ▁mill en ni um ▁BC ▁the ▁province ▁was ▁occupied ▁by ▁a ▁population ▁called ▁Um b