Fort Nez Perce/Walla Walla and Madame Dorion
West of Walla Walla is McNary National Wildlife Refuge along the Walla Walla River. Here is the Madame Dorion marker, and just up the road is the site of the original Fort Walla Walla, the Hudson Bay's Company one.
This terrain is called "shrub-steppe"
Madame Dorion's memorial marker (she's buried in the Willamette Valley, though). She was one tough lady.