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Disambiguation: for other meanings, please see Sark (disambiguation)
The poem's subject was the alleged sale of Scotland in the Anglo-Scottish Treaty of Union. The most famous town on the Sark is Gretna Green, best known for its wedding industry. The A74 motorway passes over it.
The area around the Sark was notoriously marshy and sandy, as much of the coast of the north west Irish Sea is. The small section between the lower end of the Sark and the River Esk is known as the "debatable lands", and was formerly a haven for criminals and outlaws who wished to exploit the weakness of the two countries' border defences. The boundary between the Sark and the Esk is called the Scots' Dike.
Its name is not connected with "Cutty Sark".