Missouri is a state in the Midwestern United States. The state is the 21st-most extensive in area. Missouri is bordered by eight states (tied for the most with Tennessee) - Iowa to the north, Illinois, Kentucky and Tennessee (via the Mississippi River) to the east, Arkansas to the south and Oklahoma, Kansas and Nebraska to the west.

Oregon is a state in the Pacific Northwest region on the West Coast of the United States. The Columbia River delineates much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idaho. The 42° north parallel delineates the southern boundary with California and Nevada.