Swauk Creek to Maryhill
- Distance: 137 miles
- Routes: SR 97, SR 821
- Estimated Driving time: 2.5 hours
The Yakima Valley, through which US 97, and portions of US 12 and Interstate 82 run, includes the whole rich territory tributary to the Yakima River, reaching from Lake Keechelus and Kachess to the Columbia River. It includes the valleys of the Kittitas, Naches, Ahtanum, Cowiche, Salash, Wenas, Satus, and the Toppenish. The Kittitas, or Upper Yakima Valley, fan-shaped, with an almost imperceptible slope toward the Yakima River, drains three mountain lakes, Keechelus, Kachess, and Cle Elum.