I just came across an amusing waterways map of the greater London area on the web site of the London Waterways Recovery Group. I'll leave you to follow the link rather than risk infringing their copyriht by putting the map here. Suffice it to say I like it very much as it uses pubs as the only landmarks and copies the familiar London Transport map style.
Here's a picture of another pub landmark lurking behind a weeping willow.
The Rising Sun heralds our entrance to Berkhamstead, a town well endowed with pubs, none of which (amazingly) we have yet sampled! Must put that right this year.