1) Chain 2) Chain of mountains 3) Colorado 4) Colorado mountains 5) Great Plains border 6) Mountain chain 7) Mountain range 8) Range 9) Range of mountains 10) Rocky mountains 11) The Great Divide 12) US mountains 13) Western range 1) Mountain chain 2) Mts 
[n] - the chief mountain range of western North America
Rocky Mountains noun the chief mountain range of western North America; extends from British Columbia to northern New Mexico; forms the continental divide