The Rocky Mountains are the longest mountain range in North America. They have almost a north-south direction. These mountains are going all the way from the Alaska and Canada in the north, through the eastern part of the United States, and to the Mexican frontier. This mountain range is divided into several parts, Arctic Rockies (in the north), Northern Rockies (in Canada), Middle Rockies (through most of the United States), and Southern Rockies (at the Mexican frontier).
