 and below Limpsfield Chart in Surrey it flows 21 miles 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".