Little Venice is the name given (by Browning or Byron, no one knows) to the intersection of two canals in west London. These are the Grand Union Canal and Regent’s Canal. The former was completed in 1814 and the later 1820 – both key to London’s industrial infrastructure, before (and after) railways arrived in London (between 1836-76).
The Grand Union Canal connected London with Birmingham (and points between), whilst Regent’s Canal connected with ports in the east of London.
It’s possible to walk the entire length of the Grand Union Canal from Paddington Basin to Uxbridge, a distance of around 12 miles. The wide tow path (originally for the horse-drawn barges) enables cycling in most places.