The Trinity Mountains are found in northern California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

, USA, between Trinity Lake

Trinity Lake

Trinity Lake, previously called Clair Engle Lake, is a lake on the Trinity River formed by the Trinity Dam and located in Trinity County, California, The dam was built by the U.S. Bureau of Reclamation. The lake has a capacity of , making it one of the largest reservoirs in California. The lake's...

 and Lake Shasta. The range lies in a southwest-northeasterly direction about 17 miles northwest of Redding, and stretches over a distance of 30 to 35 miles. The Chapple-Shasta Off-Highway Vehicle Area lies between the range and Shasta Lake. Peaks range from about 4,000 feet at the southern end of the mountains, to more than 7,200 feet. The Trinity Mountains contain significant forested areas including stands of Black Oak, Blue Oak

Blue Oak

Quercus douglasii, the Blue Oak, is an oak in the white oak section of the genus, Quercus sect. Quercus. It is endemic to California and is found in foothills surrounding the Central Valley of California and certain locations in the California Coast Ranges, USA...

 and Douglas-fir

Douglas-fir

Douglas-fir is one of the English common names for evergreen coniferous trees of the genus Pseudotsuga in the family Pinaceae. Other common names include Douglas tree, and Oregon pine. There are five species, two in western North America, one in Mexico, and two in eastern Asia...

; in the case of Blue Oak, Quercus douglasii, this is a disjunctive population for this California endemic tree species.