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In World War II only a few German U-boats , operating from bases 4,000 miles away in Germany and occupied Europe , inflicted crippling losses on U.S. shipping right off our southern coast . South Africa is located in the southern tip of the African continent and as bordered by the Atlantic Ocean on its western coast and the Indian Ocean on its eastern coast . Most nations that have lost money are cash-strapped , like Dominica , a Caribbean island which lost $ 400,000 and was unable to operate its only Coast Guard boat for two years . " Healthy coral reefs provide their adjacent coasts with substantially more protection from destructive tsunami waves than do unhealthy or dead reefs , a Princeton University study suggests .