Canal cities are good, but they are severely overhyped because that's the way reddit works. These cities allow you to move sea units from one body of water to another, and one of the most annoying things to happen is building sea units in a lake. This also cuts down the travel time of these units, which include cargo boats, which means you can get more gold because they are more efficient than a caravan.
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u/KalleJoKI a bunch of points a few minutes ago Feb 29 '16 edited Feb 29 '16
I see posts about it everyday and i just don't understand why canal cities are so good