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Logically enough, the maximum possible size of ship it is possible to fit through the Panama canal is called a “panamax”—which happens to be 294.1 metres in length, 32.3 metres in width, 12.0 metres in draft and 57.91 metres in height, or around 65,000 tonnes displacement (if you’re planning on taking cargo through the canal any time soon, you can read about the exact vessel requirements here).

Today, however, the buzzword for shipping is “post-panamax” (PPMX), which describes ships larger than at least one of these dimensions. And there are more and more of these around. Oil supertankers have existed…

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