Advance
Land Isolation
Despite not being an island, our land is factually isolated from the rest of Arabia due to the surrounding deserts. As such, we have learned how crucial it is to have access to the sea, and how useful it will be for us if we take that option away from our enemies.
OmanCountrypotentialAdvance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Revolutions tree itself.
Modifiers
Navy Morale+10%