Dr Who on the Thames

Boats designed for the English canals are not called barges (as used in common parlance) but 'narrow boats'.  Some canal locks can accept boats up to 70 feet long, but others are more restrictive.

This 'narrow boat', moored on the River Thames is also a short boat.  No, that is not a technical term but merely a description.  I feel that it could probably navigate almost any waterway.

The humorous name suggests that it is bigger inside than it is outside!