Took the train from Waterbeach station to Ely today, then walked the 12 miles back along the west side of the Ouse/Cam that was previously largely un-mapped. A very chilly, misty morning but it was windless and not raining, so actually a very pleasant walk. There was a short section that I did last weekend, so I by-passed this via a byway/bridle way running south from Little Thetford, which is also now on the map. I had to make quite a number of adjustments to the alignment of the river Cam, which I think was traced from satellite and originally crossed the path that I was following. It now actually runs between the two embankments for the whole route! There is a single footpath south of Little Thetford which I put in a stub for, don't know where it goes but it heads towards Stretham - this will need mapping at some stage. Most of it is also tagged embankment=yes, although there's a short section which doesn't follow the embankment and actually goes between a couple of lakes and the river. Will need a return trip to map these lakes plus the adjacent embankment. Also a section of embankment just east of Waterbeach station needs adding.