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The city of Gallipoli (Gelibolu in Turkish; light gray to pink area in center of photo) sits at a crossroads between the Sea of Marmara (to the right) and the Dardanelles Strait (which leads to the Aegean Sea). Water in the Strait flows in both northeast and southwest directions due to opposite surface and undercurrents. Several ships are visible in the Strait to the southwest of Gallipoli (center left). Image courtesy of NASA.