> the limiting factor is the max size ports can accommodate. And the size of the canals (Suez, Panama) they have to pass through in some cases. Edit: here's a

> the limiting factor is the max size ports can accommodate. And the size of the canals (Suez, Panama) they have to pass through in some cases. Edit: here's a good graphic showing max sizes for various types of ships https://en.wikipedia.org/wiki/Suezmax#/media/File:Ship_measurements_comparison.svg https://en.wikipedia.org/wiki/Suezmax#/media/File:Ship_measu...