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The continental margin is the zone of the ocean floor that separates the thin oceanic crust from thick continental crust. Continental margins constitute about 28% of the oceanic area. [1]
The transition from continental to oceanic crust commonly occurs within the outer part of the margin, called continental rise. Oceanwards beyond the edge of the rise lies the abyssal plain. The underwater part of the continental crust is called continental shelf, which usually abruptly terminates with the continental slope, which in turn terminates with the foot of the slope. The under-ocean part constitutes about 20% of the continental crust.[1]
The edge of the continental margin is a criterion for the boundary of the internationally recognized claims to underwater resources by countries in the definition of the "Continental Shelf" by the United Nations Convention on the Law of the Sea (notice that in the UN definition the "legal continental shelf" may extend beyond the geomorphological continental shelf and vice versa).
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