The Coast Ranges are a major division of the physiographic provinces of California, and abut the Klamath province and Great Valley to the east, and the Transverse province to the south. Although the C...The Coast Ranges are a major division of the physiographic provinces of California, and abut the Klamath province and Great Valley to the east, and the Transverse province to the south. Although the Coast Ranges are not immediately adjacent to the Sierra Nevada, in some places they are geologically similar, as portions of the former Sierra Nevada have been amalgamated into the Coast Ranges through tectonic violence.