civilization-5
I have a city built on the shore of a large lake. Does that count as if the city is "on a coast", for the sake of things like buildings that I can build? Notice that if I hover over the water tile it distinctively says "lake" and not "coast".
For example, can I build a lighthouse on a city situated on the shores of a lake?
After some mod-browsing, I've found a mod called "All Promotions description tooltip". It adds a tooltip when hovering over a unit's icon in the bottom-left (its symbolic icon, not its painted portrait), which nicely lists all the promotions and their effects.
Before:
When hovering over that orange Frigate icon:
So this solved the problem for me, and I highly recommend this mod.
Best Answer
No, you can't build any coast-specific buildings like lighthouse or harbor in a city near a lake. I just tried it on a Lake-type map.
There is the Garden as a lake (or river)-specific improvement.