The Dardanelles (//; Turkish: Çanakkale Boğazı, Greek: Δαρδανέλλια, Dardanellia), formerly known as Hellespont (//; Greek: Ἑλλήσποντος, Hellespontos, literally "Sea of Helle"), 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. It is located at approximately . The strait is 61 kilometres (38 mi) long but only 1.2 to 6 kilometres (0.75 to 3.7 mi) wide, averaging 55 metres (180 ft) deep with a maximum depth of 103 metres (338 ft). 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.