Just reading the manual (yes I am at work without access to the game....) when I noticed Lumbermills on forest tiles by the river also yield extra commerce.
So Grass, River, Forest goes from 2F 1S 1C to 2F 2S 2C. That's a tile supporting one pop yielding 2 shields and 2 commerce. Almost a resource tile...
Farms with biology on the same tile only yield 5 resources, 4F and 1C. Of course that is one specialist or hills being worked....
Locust strategies should keep this in mind.
It seems to me keeping forest by the river might be well worth it.
So Grass, River, Forest goes from 2F 1S 1C to 2F 2S 2C. That's a tile supporting one pop yielding 2 shields and 2 commerce. Almost a resource tile...
Farms with biology on the same tile only yield 5 resources, 4F and 1C. Of course that is one specialist or hills being worked....
Locust strategies should keep this in mind.
It seems to me keeping forest by the river might be well worth it.