Using the Cartographer's Table.
I looked through, but didn't notice many related post. What are the controls for the Cartographer's Table? I've learned right-click to place selected object, and (+) (-) keys change the brush size. Is their a way to undo an action? How do you create, edit, and delete the starting grain, material, and essence of a tile?
I'm also having trouble placing rivers. Portions of the river will float in the air and deleting a river by clicking it again leaves a black square on the map that can't be changed.
Otherwise, great game! Though I find the AI's ability to casually stroll around my fortresses to attack my capital and towns a bit annoying. Lol, that's what got me interested in building my own map with natural walls.