Colorado new mexico and what other 3 countries

I think you might be thinking of the Four Corners region!

The Four Corners is a unique region in the southwestern United States where the borders of four states meet: Colorado, New Mexico, Arizona, and Utah. Specifically, the Four Corners Monument is located where the borders of these four states intersect.

So, to answer your question, the three countries that share a border with Colorado, New Mexico, and the other two states are:

1. Mexico (to the south)
2. Canada (to the north)
3. None (the other two states, Arizona and Utah, are also part of the United States)

Let me know if you have any other questions!