 He notes the blending of the natural integrity and the sociocultural unity that gives Cascadia its definition.McCloskey is the source of the proposed Cascadian boundaries that include the complete watershed of the Columbia River, including the territories of what is now Idaho, western Montana, and smaller parts of Wyoming, Utah, and northern Nevada.According to McCloskey, this "initial" Cascadia included parts of seven jurisdictions (Northern California, Oregon, Washington, Idaho, Western Montana, British Columbia, and Southeast Alaska), running from the northernmost reaches of Southeast Alaska in the north to Cape Mendocino, California in the south–and covering all the land and "falling waters" from the continental divide at the Rocky Mountains to the Pacific Ocean.