se ▁The ▁North ▁Anna ▁River ▁is ▁formed ▁by ▁a ▁confl u ence ▁of ▁smaller ▁streams ▁in ▁western ▁Orange ▁County ▁and ▁flows ▁generally ▁sout heast ward ly . ▁ ▁The ▁river ' s ▁course ▁is ▁used ▁to ▁define ▁all ▁or ▁port ions ▁of ▁the ▁southern ▁boundaries ▁of ▁Orange , ▁Sp ots ylvan ia ▁and ▁Caroline ▁count ies ; ▁and ▁the ▁northern ▁boundaries ▁of ▁Louis a ▁and ▁Han over ▁count ies . ▁ ▁It ▁joins ▁the ▁South ▁Anna ▁River ▁to ▁form ▁the ▁Pam un key ▁River ▁on ▁the ▁common ▁boundary ▁of ▁Caroline ▁and ▁Han over ▁count ies , ▁about ▁ ▁n ortheast ▁of ▁the ▁town ▁of ▁Ash land . ▁ ▁The ▁North ▁Anna ▁Dam ▁on ▁the ▁common ▁boundary ▁of ▁Louis a ▁and ▁Sp ots ylvan ia ▁count ies ▁causes ▁the ▁river ▁to ▁form ▁Lake ▁Anna , ▁which ▁was ▁created ▁to ▁provide ▁water ▁for ▁the ▁adjacent ▁North ▁Anna ▁N uc lear ▁Gener ating ▁Station . ▁ ▁Near ▁its ▁mouth ▁the ▁North ▁Anna ▁River ▁collect s ▁the ▁Little ▁River . ▁ ▁Other ▁trib ut aries ▁of ▁the ▁North ▁Anna ▁include ▁Pam un key ▁Creek ▁and ▁Con tr ary ▁Creek . ▁ ▁See ▁also ▁List ▁of ▁Virginia ▁rivers ▁ ▁References ▁ ▁Columbia ▁Gaz etter ▁of ▁North ▁America ▁entry ▁De L orm e ▁( 2 0 0 5 ). ▁ ▁Virginia ▁Atlas ▁& ▁Gazette er . ▁ ▁Y arm outh , ▁Maine : ▁De L orm e . ▁ ▁. ▁ ▁Category : R ivers ▁of ▁Virginia ▁Category : T rib ut aries ▁of ▁the ▁York ▁River ▁( V