The mountain range that runs along the border between the USA and Canada is the Rocky Mountains, often simply called the Rockies. Stretching from New Mexico in the south to Canada in the north, this major mountain range is known for its rugged terrain, stunning landscapes, and diverse ecosystems. The Rockies are a prominent location for outdoor activities such as hiking, skiing, and wildlife viewing. They hold significant geological history and ecological importance, making them a vital area for conservation and research.