[σύρτις] from G4951; a shoal (from the sand drawn thither by the waves), i.e. the Syrtis Major or great bay on the north coast of Africa
Usages throughout the bible
Acts 27:17
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Which when they had taken up, they used helps, undergirding the ship; and, fearing lest they should fall into the quicksands, G4950 strake sail, and so were driven.