In my image, the city Ayodhya is not adding tile culture to tiles between the purple and black lines, even though the city is clearly a 500 lvl city (so it definitely would be if it were all land). I assume it must only be adding to tiles in its BFC. I notice that culture doesn't ever extend deep into the ocean, which is fine, but why not across coast tiles onto land? I imagine this as been brought up before, but I couldn't find where. It makes no sense to me from both a game balance and real world perspective. I could kinda understand it not extending if there was intervening ocean tiles (though even then, I think it should just depend on if there is land in range of where the cultural borders would be if they expanded normally with culture rings, maybe dependent on some technologies).
This makes islands next to useless for culture pressure and strategies. And how does that make sense? Its not like there are restrictions on who can settle an island. And its like the equivalent of a world where there was no cultural influence over the strait of Gibraltar, the English Channel, between sicily and italy, over the Mediterranean Sea in general, and countless other straits and islands. Which is ridiculous, even for ancient times or before motorized boats and planes.
I wonder if there was even just a single line of coast tiles between a city and other land (as opposed to 2 coast tiles as in my example), if that would affect how its culture spreads on the other side of the coast for that city. That would be even more lame. I guess I'm mostly just annoyed I cannot culture flip the Iron resource on that tile with the mine that the dutch civ owns. At least I can still get the fish and whale resources, even though whale is already obsolete, haha.
Most importantly, is there a mod, that changes this behavior, that I can use at the same time as the BUG mod? I disagree with it that much!