Building a road to a faraway city state - Are they kidding?

Question

When a really faraway city state asks me to build a road to join our two cities, is this a bug or is there a way to do it?

Answer

In general it isn't worth it, but if you build a city with a harbor nearby, it can be done without a ridiculous expense. Since a harbor extends your trade network the same as a road would, you would then just build a road from the harbor city to the city state.

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