The identification of the mouth of a river at law is a more difficult prospect
than may first appear. Geography and the action of tides can make the
location of a river mouth a difficult prospect. The law has had to face
the question of identifying the mouth of a river over the centuries and a
volume of statute and common law has built up, presenting a range of
solutions. This article considers the historic approaches taken in statute
and common law, with a view to distilling the key elements necessary to
locate the mouth of a river.