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The outer limits of the legal continental shelf cannot exceed 350 Nautical miles from the territorial sea baselines or 100 Nautical miles beyond the ................. isobath.

  • A.100 meters
  • B.200 meters
  • C.2500 meters
  • D.1000 meters

Answer: C

The isobath is 2500 meters.

Under Article 76 of the UN Convention on the Law of the Sea, a coastal state's continental shelf may extend beyond 200 nautical miles where the continental margin does. Its outer limit must not exceed either 350 nautical miles from the baselines or 100 nautical miles beyond the 2,500 metre isobath, the line joining points where the water is 2,500 metres deep (Article 76(5)).

The 100, 200 and 1,000 metre depths play no part in this rule. The 200 metre depth was the old test of the shelf under the 1958 Geneva Convention, which is why it can tempt, but UNCLOS replaced it.

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