River Darent
Fed by springs from the greensand hills south of Westerham in Kent and below Limpsfield Chart in Surrey it flows east then north by Otford and Shoreham , past the castle and the ruined Roman villa at Lullingstone , then by Eynsford , Farningham , Horton Kirby , South Darenth , Sutton-at-Hone , Darenth , and eventually to Dartford whence it proceeds a final two miles as a tidal estuary until it drops into the Thames "Long Reach" . 
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