There's no 'Swamp' terrain type in the ecology model. The five terrains are covered by vegetation (ranging from desert over farmland to forest).
Wetland is one of the water types. It won't be on the same square as a river (though it can be part of a river).
Since all farming sites are always used, the ratio farmed/normal patches can depend on the total yield: in ancient times you would see a few farms, in modern times almost the whole square covered. Or let it depend on K. or L. or farming tech.
Wetland: 50% of the normal vegetation patches can be replaced by 'pool' patches
Wetland is one of the water types. It won't be on the same square as a river (though it can be part of a river).
Since all farming sites are always used, the ratio farmed/normal patches can depend on the total yield: in ancient times you would see a few farms, in modern times almost the whole square covered. Or let it depend on K. or L. or farming tech.
Wetland: 50% of the normal vegetation patches can be replaced by 'pool' patches
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