There are stretches on the canal and the river which are free from mesh- nott hat the canal or river are in very good shape these days.
A nostalgic place for me as I spent many a happy hour in early 60s on the narrow but adequate green strip between the Longford River and the grandly named Duke of Northumberland's Canal (which is only about 3 feet deep) .
Very pleasant on a summers day with LHR on easterlies- not quite so nice when on easterlies in the winter though with the wind chill demonstrating just how flat and open LHR was in those days.