| 11. | This, together with its natural harbour, made Pasp�biac the region's main commercial centre.
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| 12. | Montecristo's only natural harbour is " Cala Maestra ", on the northwest side.
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| 13. | The city was walled and built in a natural harbour made of rock.
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| 14. | Natural harbours are formed by such barriers as headlands or reefs.
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| 15. | Burlington Bay is a natural harbour with a large sandbar called the Beachstrip.
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| 16. | Its geography creates a natural harbour with protection against monsoon weather.
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| 17. | The natural harbour was improved in 1831 by the building of a breakwater.
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| 18. | The River Fowey is famous for its sailing because of its natural harbour.
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| 19. | North Sentinel is surrounded by coral reefs, and lacks natural harbours.
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| 20. | It is situated on a natural harbour and a coral reef.
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