I came across some picture of the Palouse hills. I found out that there were also grasslands in this region. Most of the grasslands have given way to farming and other development.
I am showing just a bit about this region.
The map. US Map of The States by, the Environmental Protection Agency. I drew the little somewhat of a circle to show where the Palouse region is located.
All of the pictures are from Wikipedia Commons, except for this first one. It is of the grasslands by, National Park Service.
The last three pictures are of Palouse hills by, Lynn Suckow, from Walla Walla, Washington, USA. The first picture was taken from Steptoe Butte. The second is from Washington and western Idaho. The third is from northeast of Walla Walla, Washington.