Bosporus Strait

The lowest reading in the record, and no event to point at

The Bosporus is running at its lowest monthly level since this series begins in 2019. That sounds like a crisis and does not look like one: the fall has come in small steps over eight months rather than in a break.

Compare that with the one sharp move the record does contain. In March 2022 traffic dropped from 104 a day to 78 inside a month — the shape a closure makes. Nothing in 2026 resembles it. The strait has simply been a little quieter each month than the month before.

Why a slow decline is harder to read

A step change dates itself. A drift does not, and it is the harder pattern to judge, because any single month looks like noise and only the run of them carries information. That is the reason this page reports a 30-day mean against two baselines rather than a daily count: the daily number would hide the trend entirely.

The other Black Sea gate

The Bosporus is the Mediterranean end of the Black Sea. The Kerch Strait is the far end of the same water, and it has fallen far harder — by roughly nine tenths rather than a quarter. The two together describe a sea that has been getting quieter for years.