The natural feature that separates the eastern and western parts of the United States is the Rocky Mountains. This major mountain range extends from Canada through the western U.S. to New Mexico. The Rockies are known for their stunning landscape, diverse ecosystems, and recreational opportunities such as hiking, skiing, and wildlife observation. The mountains also play a significant role in climate patterns, affecting rainfall and temperature distribution in the region. The Rocky Mountains have cultural and historical importance, influencing the exploration and settlement patterns in the United States.