1810 The Dardanelles

From the time of Homer a small strait of water from the aegean to the black sea has proved both a strategic crossing point and a symbolic one, being the divide between Europe and Asia. It has provided a line from which invasions have started, and a channel when blocked that prevents access to the wider world from the Black sea.

The Dardanelles, situated in what is now Northwest Turkey, is 38 miles long and just three quarter of a mile wide, at the thinnest point. From the Aegean it runs to the small inland sea of Marmara, which connects the Bosphorus, another strait 17 miles in length,  to the Black Sea.