Which major river of the USA forms the border between the states of California and Arizona?
Course of the Colorado River Course of the Colorado River The Colorado River is a major river of the western United States and northwest Mexico in North America. Its headwaters are in the Rocky Mountains where La Poudre Pass Lake is its source. Located in north central Colorado it flows southwest through the Colorado Plateau country of western Colorado, southeastern Utah and northwestern Arizona where it flows through the Grand Canyon. It turns south near Las Vegas, Nevada, forming the Arizona–Nevada border in Lake Mead and the Arizona–California border a few miles below Davis Dam between Laughlin, Nevada and Needles, California California before entering Mexico
The Californias Valley (the river forms the present day border between the states of California and Arizona). The Californias The Californias (Spanish: Las Californias), occasionally known as the Three Californias or Two Californias, are a region of North America spanning the United States and Mexico and consisting of the U.S. state of California and the Mexican states of Baja California and Baja California Sur. Historically, the term ""The Californias"" was used to define the vast northwestern region of Spanish America, as the "Province of the Californias" (), and later as a collective term for Alta California and the Baja California Peninsula. Originally