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(1)For the purposes of this Act, the Ministry may by order define, by reference to a map or otherwise,—
(a)the mouth of any river at its entrance into any lake or the sea;
(b)the mouth of any tributary river at its entrance into any other river;
(c)the boundary between the tidal and freshwater portions of any river;
(d)the point or points to or from which distances are to be measured under this Act;
(e)the areas within which it is prohibited under this Act to use or practise certain methods of fishing;
F1[(f)the boundary between so much of[F2 the Northern Ireland zone] as is within, and so much thereof as is without, the Londonderry Area.]
(2)Where several rivers flow into a common mouth or estuary, an order under this section may declare that the outlets of such rivers form separate mouths.
F2SI 2002/790