These are the main length between Greywell and Brookwood Lye, and a short stretch between Monument Bridge and Scotland Bridge in Woking. It is the most botanically-rich aquatic area in England and flora include the nationally scarce hairlike pondweed and the nationally scarce tasteless water-pepper. The site is also nationally important for its invertebrates. There are 24 species of dragonfly and other species include two nationally rare Red Data Book insects. Eastwards from the mid point of the canal, it is surrounded by large areas of heathland. These are habitats for reptilian species, such as vipers and lizards, and birds such as nightjars, woodlarks and Dartford warblers. Much of this heath survives today due to its use since the late 19th century as military training areas. Lost sections of the canal The canal originally started from the centre of Basingstoke, but the first of route have now been lost. This section of the canal fell into disuse after the closure of the Greywell Tunnel, due to a lack of boat traffic, general neglect and a lack of water. There were no locks on the canal after Ash, so the route generally followed the contours of the land with occasional cuttings, tunnels and embankments. The route can be partly determined by noting that the canal falls between the 75m and 80m contours on Ordnance Survey maps, and can be traced on historical map overlays as available at the National Library of Scotland. The canal started at a basin, roughly where the present day Basingstoke Bus Station is located. From there it ran eastwards parallel to the River Loddon following Eastrop Way, before passing under the A339 Ringway East. It then made a long loop southwards and then eastwards again, partly on an embankment, passing over small streams and water meadows. The furthest visible sign of the canal today is the buried Red Bridge, which can be seen where Redbridge Lane turns northwards west of the Basing House ruins. From here the canal route passed to the north of Basing House and through Old Basing village. Some remaining cuttings, which may contain water in wet weather, can be found just off Milkingpen Lane and behind the Belle View Road/Cavalier Road estate. There was then another southwards loop, crossing the routes of the present day A30 and M3 and then across the Lyde River at Hatch. From here the canal ran eastwards across