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In comparison, a commonly-used portage in Greece was only 8km long: https://en.wikipedia.org/wiki/Diolkos

Much less work, but of course much less benefit.

>> the ancient trade and military route located on the shortest distance (ca. 70 kilometers)

Wow, that was used for a long time. The Greek one was 700 years.

There is another in North America that was used for thousands of years before the French found it: