4. (a) For the purposes of this Convention, the coastal
State shall establish the outer edge of the continental margin
wherever the margin extends beyond 200 [nm] from the baselines
from which the breadth of the territorial sea is measured, by either:
(i) a line delineated in accordance with paragraph 7 by
reference to the outermost fixed points at each of which the
thickness of sedimentary rocks is at least 1 per cent of the
shortest distance from such point to the foot of the continental
slope; or
(ii) a line delineated in accordance with paragraph 7 by
reference to fixed points not more than 60 [nm] from the foot of
the continental slope.
(b) In the absence of evidence to the contrary, the foot of the
continental slope shall be determined as the point of maximum
change in the gradient at its base.
5. The fixed points comprising the line of the outer limits of
the continental shelf on the seabed, drawn in accordance with
paragraph 4 (a)(i) and (ii), either shall not exceed 350 [nm] from
the baselines from which the breadth of the territorial sea is
measured or shall not exceed 100 [nm] from the 2,500 metre
isobath, which is a line connecting the depth of 2,500 metres.