As of now, the best thing to have in the game appears to be lots of land, with very few rivers, oceans, hills and lots of dense forests that can be chopped and converted to coal. This may change in the future as fishing, prismatic liquid and military combat is added. However for now, pure flat land as far as the eye can see will be the goal. When this changes or as I come across more map seeds, I will update this page.
Large land area, few hills, dense forests
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