The annual Montreux Convention indexation pushed fees from $5.83 to $6.70 per net tonne; a 10,000-tonne vessel now pays roughly $25,000 per passage, compounding post-Iran-war shipping costs as Turkey hosts the NATO summit
The Bosphorus and Dardanelles, governed by Turkey under the 1936 Montreux Convention, are the only maritime passage between the Black Sea and the Mediterranean.
full dossier ›Eight narrow passages where geography concentrates enough energy and cargo that a single closure cascades into higher freight rates and global supply disruption.