The bloody shoreline
This is a fifth edition DnD game.
The core game will take place over 3 small neighbouring nations. I have a lot of stuff created already for these nations, but the world can be easily filled in by player ideas and character concepts. Similarly, I have a handful of gods for the pantheon filled in already, but players are welcome to contribute.
The two nations that are on land are engaged in something of a cold war. Troops are stationed at the borders, but neither has invaded the other. Trade is more regulated than usual, but individuals are still free to travel as desired.
There are presently peace talks between Amberra and an underwater metropolis nation that consists of most of the 'good' seafolk (ie. not Sahuagin, who they're at war with).