ortheast ▁of ▁Front ▁Royal ▁near ▁River ton , ▁by ▁the ▁confl u ence ▁of ▁the ▁South ▁F ork ▁and ▁the ▁North ▁F ork . ▁It ▁flows ▁n ortheast ▁across ▁Warren ▁County , ▁passing ▁under ne ath ▁Inter state ▁ 6 6 ▁ ▁from ▁its ▁formation . ▁Bey ond ▁the ▁I - 6 6 ▁bridge ▁the ▁river ▁flows ▁through ▁a ▁set ▁of ▁b ends ▁before ▁turning ▁to ▁the ▁n ortheast ▁again , ▁crossing ▁into ▁Clar ke ▁County ▁ ▁below ▁I - 6 6 . ▁ ▁Five ▁miles ▁( 8   km ) ▁down river ▁from ▁the ▁Clar ke ▁County ▁border , ▁the ▁Sh en ando ah ▁passes ▁under ▁U . S . ▁Route ▁ 5 0 ▁and ▁then ▁passes ▁through ▁a ▁triple ▁b end . ▁ ▁below ▁the ▁Route ▁ 5 0 ▁bridge , ▁the ▁river ▁passes ▁under ne ath ▁State ▁Route ▁ 7 ▁and ▁then ▁continues ▁n ortheast ▁another ▁ ▁where ▁it ▁cross es ▁into ▁Jefferson ▁County ▁in ▁West ▁Virginia . ▁Once ▁in ▁West ▁Virginia ▁the ▁river ▁comple tes ▁six ▁large ▁b ends ▁before ▁joining ▁with ▁the ▁Pot om ac ▁from ▁the ▁south west ▁near ▁Har pers ▁Fer ry . ▁The ▁confl u ence ▁is ▁on ▁the ▁West ▁Virginia - M ary land ▁border ▁and ▁ ▁from ▁the ▁Virginia - West ▁Virginia ▁border . ▁ ▁Ge ology ▁ ▁The ▁Sh en ando ah ▁valley ▁is ▁under lain ▁by ▁lim estone . ▁The ▁fert ile ▁soil ▁made ▁it ▁a ▁fav ored ▁place ▁for ▁early ▁settlement . ▁ ▁It ▁continues ▁to ▁be ▁a ▁major ▁agricult