The Basingstoke Canal was originally built to link Basingstoke with the River Thames at Weybridge via the Wey Navigation.
The canal is approx. 40 miles long but the last 5 miles are unnavigable. This is due to the final section near Basingstoke being abandoned and built over, also due to the collapse of the Greywell Tunnel, the limit of navigation is just west of Odiham in Hampshire.
The photos are from a walk from Ash Vale, over the Ash Aqueduct up to Ash Lock (lock no. 29).
Information about the Basingstoke Canal can be found on the Canal Authority website.