Bosphorus

Like the Bosphorus, it separates Europe (the Gallipoli peninsula) from the mainland of Asia. The strait is an international waterway, and together with the Bosphorus, the Hellespont connects the Black Sea to the Mediterranean Sea. The strait is narrowest is between Saricay (a district of Çanakkale) on the Asian side to Kilitbahir on the European side.

Hellespont and Dardanelles

Hellespont (Greek: Ελλήσποντος, Hellespontos), literally "Sea of Helle" is also called the Dardanelles (Turkish: Çanakkale Boğazı, Greek: Δαρδανέλλια, Dardanellia).

Hellespont is a narrow strait in northwestern Turkey connecting the Aegean Sea to the Sea of Marmara. It is one of the Turkish Straits, along with its counterpart the Bosphorus.

The strait is 61 kilometers (38 miles) long but only 1.2 to 6 kilometers (0.75 to 3.7 miles) wide.

Water flows in both directions along the strait, from the Sea of Marmara to the Aegean via a surface current and in the opposite direction via an undercurrent.