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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

The Lee Navigation is a canalised river incorporating the River Lea (River Lee). It runs from Hertford Castle Weir to the River Thames at Bow Creek; its first lock is Hertford Lock and its last Bow Locks.
See Wikipedia article: Link