This large unit spans multiple ecosystems. The Snake River Breaks is the dominant feature along the northern border of the unit, winding down to Lake Sacajawea and ultimately into Lake Wallula along the western boundary. The furthermost west ground is comprised of private irrigated crops, many of which are listed in the Feel Free to Hunt program, along with the McNary National Wildlife Refuge along Lake Wallula and Walla Walla River. Oregon forms the southern boundary, south of the Walla Walla River Valley, which consists of large tracts of irrigated farms and some urban sprawl. From the City of Walla Walla, the border runs up Hwy 12 to Road 127 which crosses the Snake River at Peyton.

This large unit presents hunters with many options, gaining private land access will be very beneficial here.