The resources are randomly generated. Instructions for randomization are included with the opening post. I find preplaced resources to be too predictable. When I do a new version, I rerandomize everything, but you can do so yourself as mentioned in the first post. The grasslands on my map are largely restricted to river valleys and adjacent to lakes. I'll take a look to see if I can add more grassland given that supposition. Maybe there's a river or two that might be added.