On Sunday we went to the Three Locks Pub in Stoke Hammond. The food was very run of the mill, but it was the location we were there for. It's a series of three locks which take the canal traffic up or down hill, depending on the direction they're going. The water level inside the locks is raised or lowered to the same level as the section of canal being exited, the gates are opened, the boat moves into the lock, and the gates are closed again. Then the water level is then raised or lowered to the same level as the section of canal being entered, gates are opened, boat moves out of lock etc. etc. etc.

This picture was taken from the middle of the gate of the first lock, looking downhill to the other two locks.
This is the second lock.
Looking at the third and lowest lock, from within the area of the second lock.
This last picture was taken from the open area outside the pub which is alongside the third lock. You can see wild flowers growing at the top of the gate, and some canal boats pulled up at the bank, with people sitting and eating lunch on the towpath.
This is a gorgeous area, and life on and around the canal is slow and relatively calm. I wouldn't like to fall in the water, though. It looks a bit murky.