(1) A
"dividing fence" means a fence on the common boundary of adjoining lands.
(2)
A fence separating the land of adjoining owners constructed on a line other
than the common boundary is also a dividing fence if—
(a) it is
impracticable to construct a fence entirely on the common boundary of the
adjoining lands because of natural physical features; or
(b) the adjoining
land includes 1 or more parcels of pastoral land separated by a watercourse,
lake, or other natural or artificial feature insufficient to stop the passage
of stock at all times.