My favorite game: Why aren't these settlements connected? (Image)

[BrianKindly]

Any ideas?

1. Only 4 tiles away over water
2. Both have water districts, even bought ports on both to be sure
3. Valencia is connected via water to further settlements
4. Tried setting Tampico to a fishing town
5. Tried using a merchant to create a route
6. You can see that Valencia has connections to 5 cities and 1 fishing town

 

[RaidandTrade]

You probably need to build ports and railroads in each and wait a random number of turns…