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In page Geography of Saudi Arabia:

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The coast is extremely irregular, merging sandy plains, marshes, and salt flats almost imperceptibly with the sea. As a result, the land surface is unstable; in places water rises almost to the surface, and the sea is shallow, with shoals and reefs extending far offshore. Only the construction of long moles at Ras Tanura has opened the Saudi coast on the gulf to seagoing tankers.[citation needed]