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The River Lea (or Lee) originates at Marsh Farm Leagrave, Luton in the Chiltern Hills and flows generally southeast, east, and then south to London where it meets the River Thames. The river is 42 miles long.
Wikipedia: Link

A Narrowboat is a long thin boat, designed to fit the canals of England and Wales. They were 7 feet (2.1 metres) wide, and up to 70 feet (21 metres) in length, the maximum that will fit in a standard lock.

In the 18th century before the age of steam railways and the internal combustion engines, the canals were one of the key systems of transporting goods around the country. The boats were towed by a shire horse walking along the tow-path. Of course boats today are powered by diesel engines.

Most narrowboats today are used for holidays & leisure cruising, and some are used as homes.

Read more at wikipedia Link