The Scarp, Scotland reference article from the English Wikipedia on 24-Apr-2004
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Scarp, Scotland

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Scarp is an island in the Outer Hebrides of Scotland, west of Hushinish on Harris. The island, which has not been permanantly inhabited since 1970, is over 300 metres high.

While a shallow ford links the island to Harris, it is often impassable due to strong currents. As a result, in 1934 an experiment was conducted, attempting to deliver the island's mail by rocket, but it was a failure.