Fontana is a city in San Bernardino County, California, United States. Located in the heart of the Inland Empire region of southern California, the City of Fontana is a fast-growing community known for its varied and colorful history, and for some of its important new local landmarks. Originally a rural town known for an abundance of chicken ranches, hog farms, and citrus and walnut orchards, over the past century Fontana has developed rapidly into a major commuter suburb for Los Angeles and other nearby cities, as well as a strategic regional hub of the trucking industry. While Fontana is within driving distance of several of the mountain resorts, beaches, lakes and desert areas of Southern California, the city is also becoming a destination in its own right. It is home to several newly built landmarks, such as the largest of the San Bernardino County system libraries, a renovated historic theater, a huge new municipal park, and the Auto Club Speedway, a NASCAR racetrack located on the site of the historic Kaiser Steel Mill. Fontana is also home to the Fontana Days Half Marathon and 5K run. This race is on record as the fastest half marathon course in the world.