This is of course a vast area and it includes Estolad, the ridge of Andram and the cluster of hills called Ramdal, as well as Amon Ereb that's seprated from Andram. Gelion runs southwards to the East and Thargelion is on the other side of that river. You could, or should include Nan Elmoth and Ossiriand as well. But let's focus on the great grassland of central Eastern Beleriand here, and also include Estolad.