We tried to find maps of the neighboring

I was diagnosed with bullous emphysema several years ago. My husband and I currently live in California, but are interested in moving or about to, Colorado to be closer to our grandchildren. According to the lung doctor, it is too risky for me to live in an area lasix drug interactions with high altitude. We tried to find maps of the neighboring states of Colorado, but have difficulty in finding areas / towns with small height. Does anyone have any suggestions or tips that they could share? We would appreciate any help. Thanks in advance for your time. .