the river viewed enfield island village the source said @ head inside waulud s bank @ leagrave, there river lea fed houghton brook, stream starts 2 miles (3.2 km) further west in houghton regis. river flows through (or by) luton, harpenden, welwyn garden city, hertford changes small shallow river deep canal @ hertford castle weir, flows on ware, stanstead abbotts, hoddesdon, broxbourne, cheshunt, waltham abbey, enfield lock, ponders end, edmonton, chingford, tottenham, walthamstow, upper clapton, leyton, hackney wick, stratford, bromley-by-bow (past fish island), poplar, canning town , leamouth meets river thames (as bow creek). forms traditional boundary between counties of middlesex , essex, , used part of danelaw boundary. forms part of boundary between essex , hertfordshire. a pedestrian suspension bridge spans boating lake created widened river flows through wardown park in luton. for of distance river runs within or boundary lee valley park. between tottenham , hackney lea fe...