The Silurian Hills are a small range of hills in the Mojave Desert

Mojave Desert

The Mojave Desert occupies a significant portion of southeastern California and smaller parts of central California, southern Nevada, southwestern Utah and northwestern Arizona, in the United States...

, to the east of the Avawatz Mountains

Avawatz Mountains

The Avawatz Mountains are located in San Bernardino County in the Mojave Desert of San Bernardino County, California, USA.-Name:The name "Avawatz" is derived from the Mohave Indian term "Avi-Ahwat", or "red rock".-Geography:...

 and Silurian Valley in the southeastern portion of the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of 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...

.

The range lies in a northwest-southeasterly direction, and is about nine miles long. The Shadow Mountains

Shadow Mountains

The Shadow Mountains are located in the Mojave Desert of eastern California in the United States. The mountains lie in a generally north-south direction south of the Kingston Range and east of the Avawatz Mountains and the Silurian Hills....

 lie to the east, and the small community of Halloran Springs

Halloran Springs, California

Halloran Springs is an unincorporated community in San Bernardino County, California, USA. It lies at in the Mojave Desert approximately 15 miles northeast of Baker, California on Interstate 15 between Baker and Las Vegas, Nevada....

 near Interstate 15

Interstate 15 in California

In the U.S. state of California, Interstate 15 is a major north–south route through the San Bernardino, Riverside, and San Diego Counties, and it has a length of in the state. It is a major thoroughfare for traffic between Southern California and Las Vegas, Nevada, as well as points beyond...

lies about 12 miles to the southeast.