Where any Offence under this Act is committed in or upon any Waters forming the Boundary between any Two Counties, such Offence may be prosecuted before a Sheriff or Two Justices of the Peace in either of such Counties, and any Offence committed under this Act on the Sea Coast, or at Sea beyond the ordinary Jurisdiction of any Sheriff or Justices of the Peace, shall be held to have been committed within the Body of any County abutting on such Sea Coast, or adjoining such Sea, and may be tried and punished accordingly.