High Quality Content by WIKIPEDIA articles! The Round Mountain Oil Field is a large oil and gas field in the foothills of the Sierra Nevada Mountains, about ten miles (16 km) northeast of Bakersfield, California. It is east of the giant Kern River Oil Field, one of the largest in the United States, and also close to the Mount Poso Oil Field and Kern Front Oil Field. With a cumulative total recovery of more than 110 million barrels of oil, it is the 48th largest oil field in California, but remains relatively productive with still about ten percent of its reserves remaining in the ground, according the California Department of Oil, Gas, and Geothermal Resources (DOGGR).