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by toasterlovin 2870 days ago
I’m sure that’s a factor. But most of the largest cities in the world are specifically on the coast or on a large river very close to the coast. You can’t drink the water in the ocean, so that leaves trade as the main driver (by my reckoning, at least).
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> You can’t drink the water in the ocean

Yes, that's why I wrote only about rivers, but I think a lot of the big coastal cities are built on an estuary too. My point was implementation on a river is not just for transportation, but also access to other benefits, like easy access to water. For coastal cities, they also have access to fishing (rivers can also give access to fish, but not the same amounts).