Auburn State Recreation Area is a state park unit of California, USA, along 40 miles (64 km) of the North and Middle Forks of the American River. The state recreation area (SRA) is situated on the border of Placer and El Dorado Counties in the heart of historic Gold Country. The largest city with close proximity is the city of Auburn. Once teeming with gold mining activity, the area now offers a wide variety of outdoor recreational opportunities. Major recreational uses include trail running, hiking, swimming, boating, fishing, camping, mountain biking, gold panning, horseback riding, road bicycling, and off-highway motorcycle riding. Whitewater recreation is also very popular on both forks of the river, with Class II, III and IV runs.