Black Sea to Atlantic: Seven Waterway Transits Required

A ship traveling from the Black Sea to the Atlantic Ocean must pass through this sequence:

1. Bosporus Strait (Istanbul) - 31km, narrow, busy
2. Sea of Marmara - 11,350 km² inland sea
3. Dardanelles Strait (Çanakkale) - 61km, strategic chokepoint
4. Aegean Sea - Greek/Turkish islands, Mediterranean subdivision
5. Mediterranean Sea - Full east-west traverse
6. Strait of Gibraltar - 14km wide, Africa-Europe boundary
7. Atlantic Ocean - Open ocean

Governance

Turkish Straits (Bosporus + Dardanelles) governed by Montreux Convention (1936)—Turkey controls warship passage. Gibraltar: UK/Spanish/Moroccan waters, international transit rights.

Distance and Time

~2,500 nautical miles from Istanbul to Gibraltar. 7-10 days for commercial vessels depending on traffic, weather, stops.

This historic route has moved civilizations, empires, and global trade for millennia.