Test Hill is a popular tourist destination in the Salton Sea watershed of California. It is a steep mountain that was formed from sediment left behind by the Colorado River. The hill got its name because the military used to conduct bomb tests on it during World War II. Today, Test Hill is a popular spot for off-roading enthusiasts. Visitors can drive up the steep slope and enjoy the scenic views from the top. The area also offers plenty of opportunities for hiking, biking, and camping. Visitors may spot various wildlife species, including bighorn sheep, coyotes, and owls.

In addition to its recreational opportunities, Test Hill offers a unique glimpse into California's history. The area was once part of the ancient Lake Cahuilla, which covered much of the Salton Basin. Today, visitors can see evidence of the past in the form of fossils and shells embedded in the hill's sedimentary layers. The area also has a rich cultural history, with evidence of human habitation dating back thousands of years. Visitors can see petroglyphs and other artifacts left behind by the region's indigenous peoples. Overall, Test Hill is a must-see destination for anyone interested in California's natural and cultural history.