Grand Union Canal
The Grand Union Canal dates from the 18th century when it originally linked the canal systems of Leicestershire and Northamptonshire. Over time various other canals joined the Grand Union Canal, linking canal systems all over the UK.
You can find out more about London's canals at the Canal Museum on New Wharf Road.
If you are particularly energetic, there is now a National Waterway Walk, which follows the route of the Grand Union Canal all the way from London to Birmingham at a distance of nearly 150 miles.