Colorado's eastern border is with Kansas and Nebraska.
Kansas and Colorado touch Oklahoma's northern border.
Colorado and Kansas touch Oklahoma to the north.
Kansas
Phoenix is about 370 miles from the border of Colorado.
Colorado, Nebraska, Missouri, Oklahoma
Yes, they do.
No mountains border Kansas. Kansas is flat if there were mountains then they wouldn't have tornadoes. Now, Colorado borders Kansas and Colorado has the Rocky mountains but those run up the western side of the state.
The entire western boundary of Kansas is included in the border of Colorado.
Oklahoma and Colorado share a common border.
Kansas shares its borders with Colorado, Nebraska, Missouri, and Oklahoma.
Kansas is on the direct East, Nebraska is on the Northeast, and a small sliver of Oklahoma is on the southeast.