The United states and Canada share the slender,mountain ringed Okanagan valley along the Okanagan lake and river. The sunny Okanagan valley interior plateau seperated the coastal mountains from the Rockies. It extends hundreds of miles north and also south into Central Washington. At the border near near Osoyoos is Canada's celebrated and only desert, a northern outlier of the sonoran desert.
The route divides into two different halves. From the Canadian rockies wonderland of Banff and Jasper south as far as sun valley. From the western flanks of Glaciour National Park, US-93 runs along river valleys through diverse communities. Western montanas natural beauty reaches a peak in the Bitterroot valley. It stretches south from Missoula all the way to the Idaho borders.
Continuing south into Nevada, US‑93 embarks on what is truly, if not officially, the “Loneliest Road in America,” traveling across 500 miles of Great Basin Desert. The hottest North American deserts,a distinctly bimodal rainfall pattern produces a high biological diversity. Winter storms from the Pacific nourish many West Coast annuals such as poppies and lupines, while well-developed summer monsoons host both annuals and woody plants originating from the south.