Yes, I like those rivers much better now!

As for the grassland color - personally, yeah, I tend to go for greener colors, although I guess it would depend a lot on latitude and temperature and the actual plant life found there. If it's a 'true' grassland or steppe, like central Asia or the US's Great Plains, then a tannish color seems more apt. But if it's more like a semi-wooded grassland, then more green.