Bosphorus
4HighTransit data to 28 Aug · IMF PortWatch derived, lags a few days
75% of baseline
64 a day against a 12-month average of 86
+6.1%
7-day average 64 transits/day, down 25% vs the trailing 12-month average. Source: IMF PortWatch, data to 2026-08-28.
Compare two weeks
53 weeks held99.1 transits/day in the week to 2025-08-29 (114% of baseline), against 64.4 in the week to 2026-08-28 (75% of baseline) — down 35%.
Seven-day averages, sampled weekly, from IMF PortWatch's published daily series, 2025-08-29 to 2026-08-28. One baseline across every week, so a share moves for one reason only. Reconstructed from the published record, not an archive this product watched accumulate.
Disrupted for 45 days, since 2026-07-15, running 24% below baseline on average.
3 disruption episodes in the last 12 months; the current one began 2026-07-15 and has run 45 days.
24% below baseline on average, with a trough of 38 transits a day.
17% below baseline on average, with a trough of 53 transits a day.
17% below baseline on average, with a trough of 5 transits a day.
The only sea route out of the Black Sea, carrying Russian and Kazakh crude and products plus Ukrainian grain. Turkey administers passage under the Montreux Convention, which also governs warship access. Friction here shows up as tanker queues, insurance arguments, and grain-corridor risk premia.
Tanker queue lengths and Turkish insurance-documentation requirements.
The state of the Black Sea grain corridor and strikes on Ukrainian ports upstream.
Montreux-related decisions on warship passage during escalation.