Along the west coast of North America, from Mexico to southern Canada, are mountain ranges of diverse character collectively called the Coast Ranges. The Olympic Mountains, at the extreme north-west corner of the conterminous United States, are a unique part of these ranges. Even though they are closely related in rock composition to the Coast Ranges of Oregon, they are separated from them by the broad lowland of the Chehalis River and are considerably higher and more rugged. They have some scenery in common with the Insular Ranges of Vancouver Island in Canada but are quite different geologicalIy. To learn more about the geology of the region, or to take a virtual field trip, click on one of the links below.