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The Grand Union is a 137 mile (220km), 166 lock, 2 tunnel canal running between Brentford in London and Birmingham. It is the longest canal in Britain, and has 11 main arms and junctions. It takes over a week to navigate.

The Leicester arm branches off at Norton Junction and runs 66 miles long through 59 locks (including 2 staircase locks at Foxton) and 2 tunnels to Leicester where it continues into the River Soar.

Read more at Wikipedia Link

This canal is on a route with no locks from Southall to Paddington. Many canal boats are moored permanently, or move between places where they can moor for a few weeks. Others are touring. Most canal boats here are narrow boats, but there are some wider boats which can access up from the Thames at Brentford.