▁tr out ▁river ▁ren owned ▁throughout ▁the ▁East ▁coast ▁of ▁England . ▁ ▁But ▁in ▁the ▁late ▁ 1 9 6 0 s , ▁the ▁Ang li an ▁Water ▁Author ity ▁took ▁control ▁of ▁the ▁river , ▁and ▁there after ▁it ▁became ▁rapidly ▁de grad ed , ▁due ▁mostly ▁to ▁over - ab stra ction ▁of ▁water ▁for ▁use ▁in ▁far ming . ▁ ▁Cour se ▁The ▁S lea ▁r ises ▁near ▁West ▁Will ough by , ▁two ▁miles ▁south - west ▁of ▁An c aster , ▁at ▁an ▁alt itude ▁of ▁ 7 0 ▁metres . ▁The ▁river ▁desc ends ▁ 3 0 ▁metres ▁in ▁the ▁first ▁ 3 ▁km ▁of ▁its ▁course ▁through ▁An c aster ▁before ▁flow ing ▁past ▁a ▁Site ▁of ▁Special ▁Scient ific ▁Interest ▁( al ong side ▁S leaf ord ▁G olf ▁Club ) ▁into ▁S leaf ord . ▁ ▁Through ▁S leaf ord ▁it ▁flows ▁above ▁ground ▁in ▁two ▁separate ▁courses , ▁and ▁then ▁curves ▁around ▁the ▁foot ▁of ▁The ▁Hub ▁where ▁a ▁new ▁rivers ide ▁sculpt ure ▁walk ▁follows ▁it . ▁Le aving ▁S leaf ord , ▁it ▁passes ▁Ha ver hol me ▁and ▁runs ▁down ▁through ▁South ▁K yme ▁where ▁it ▁is ▁known ▁as ▁the ▁K yme ▁E au ▁to ▁join ▁the ▁River ▁With am ▁at ▁Chap el ▁Hill . ▁ ▁S lea ▁Navigation ▁ ▁The ▁River ▁S lea ▁was ▁made ▁navig able ▁from ▁the ▁With am ▁up ▁to ▁S leaf ord ▁in ▁ 1 7 9 4 , ▁although ▁these ▁navig ations ▁were