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.
Modoc County is a county of USA. They belong to the California state. It has a population of 5619 citizens. In 2007, 95% of people in the county living in the metropolitan area of the capital.
Siskiyou County has a very healthy climate, as its 24364 citizens bear this out. Comparing Siskiyou County with other provinces, their communications within USA can be improved.