The Colorado River.
The state that borders Arizona, Nevada, and Idaho is Utah.
Arizona borders four states including New Mexico, Utah, Nevada, and California. However, California is Arizona's only state bordering the Pacific coast.
California
The great state of California!
california
The Mexican State of Baja California is bordered on the north by the US States of California and Arizona, on the south by the Mexican State of Baja California Sur, and on the east by the Mexican State of Sonora. Its east coast is on the Gulf of Cortez and its west coast is on the Pacific Ocean.
Arizona and Nevada.
The Colorado River forms the border between California and Arizona.
California
California borders 3 states: Oregon, Nevada, and Arizona.
There are five states; California, Oregon, Idaho, Utah and Arizona
Baja California is the Mexican state that completely borders the southern US. but technically Arizona would border the southern California, in US states.