Terwilliger Valley is a basin in Riverside County, California. The valley lies at an elevation of .
Geography It is 2 miles southeast of Anza Valley, however unlike Terwilliger Valley, water from the Anza Valley eventually drains into the Pacific Ocean. Terwilliger Valley is drained by Coyote Creek, which leads to Coyote Canyon in Anza-Borrego Desert State Park, a popular destination for desert wildflower viewing.Anza-Borrego Desert State Park - Wildflowers from theabf.org accessed February 5, 2025.
The basin is immediately west of the San Jacinto Fault.Terwilliger Valley Groundwater Basin from water.ca.gov accessed February 5, 2025. It was the site of a 6.0 earthquake in 1937.San Jacinto Fault (Terwilliger Valley) Earthquake from scedc.caltech.edu accessed February 5, 2025.
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