Tehama County, like the rest of the region, has a mountainous interior. This mountainous interior features deep and steep valleys, formed by major rivers running through it.
Siskiyou County is a county of USA. They belong to the California state. It has a population of 24364 citizens. In 2007, 77% of people in the county living in the metropolitan area of the capital.
Shasta County has a very healthy climate, as its 129357 citizens bear this out. Comparing Shasta County with other provinces, their communications within USA can be improved.