Start: Rickmansworth Station (TQ 057 945)
(S) From the station, turn right onto Station Road and follow it under the railway lines.
(1) At the High Street, keep ahead on the footpath opposite (slightly to your right).
(2) Turn right on Ebury Road, then right and left to reach the roundabout.
(3) Keep left, cross the road and turn left, then right over the footbridge into the Aquadrome Local Nature Reserve.
(4) Turn right and follow the Colne Valley Trail to the Aquadrome car park. Turn right and keep following the Cole Valley Trail and any diversions to reach the canal.
(5) Turn right along the towpath and pass three locks before reaching the Coy Carp Pub at Pynesfield Lake.
(6) From the pub, continue past the Broadwater Lake Nature Reserve to reach the River Garden pub.
(7) A little further on, the canal goes under the new bridge constructed for the HS2 railway line, followed by the one carrying the Chiltern Railway line. The next lock is Denham, the deepest on the Grand Union Canal.
Option: Just before the busy A40, a footbridge on the right leads to the Denham Country Park, where there are amenities.
(8) Continue under the A40 as the surroundings become more urban, although the River Colne still runs alongside. Go under the A4020 and the A4007, and after a mile, reach the Malt Shovel at Cowley Lock.
(9) After another mile, the Slough Arm of the canal takes off on the right. This was built in the late 19th Century to transport bricks from Slough to London.
(10) Keep following the Grand Union Canal and go under a minor road bridge.
(11) After the following bridge, leave the canal and keep turning left to reach West Drayton Station.(E)