In her collaboration with Virginia Beahan No Ordinary Land, Mcphee explores the ways people interact with the landscapes in which they live.
In River of no Return She focuses on Idaho's Sawtooth Valley. From Yale Press:
"McPhee depicts the magnificence and history of the Sawtooth Valley in central Idaho. Her subject matter includes the region’s spectacular mountain ranges, rivers, and ranchlands; its immense spaces and natural resources; the effects of mining and devastating wildfires; and the human stories of those who live and work there."