I have some simple suggestions that would hopefully make the game more interesting and realistic, without too much complexity.
* There should be a "strait" terrain type, like Öresund (between Sweden and Denmark), the Bosporous (at Istanbul) and the Strait of Gibraltar. Naval units should be slowed down at Straits. Ground units should be able to cross the strait without ships, but that would take several turns. In the late game you should be able to build bridges across straits. This terrain type could also be used to simulate great rivers. Straits would give a good food and commerce output.
* A ship that enters a city with access to more than one body of water should have to return to the same body of water that it came from. But - as technology advances you would learn to build Canals. They would allow ships to pass through them to inland cities or bodies of water. Canals would also give a commerce and shield bonus, like Railroads.
* There should be a "strait" terrain type, like Öresund (between Sweden and Denmark), the Bosporous (at Istanbul) and the Strait of Gibraltar. Naval units should be slowed down at Straits. Ground units should be able to cross the strait without ships, but that would take several turns. In the late game you should be able to build bridges across straits. This terrain type could also be used to simulate great rivers. Straits would give a good food and commerce output.
* A ship that enters a city with access to more than one body of water should have to return to the same body of water that it came from. But - as technology advances you would learn to build Canals. They would allow ships to pass through them to inland cities or bodies of water. Canals would also give a commerce and shield bonus, like Railroads.
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