Knott's Berry Farm is a 57-acre (23 ha) amusement park in Buena Park, California, United States. Owned and operated by Six Flags, the park officially opened as Knott's Berry Farm in 1947. Since 2016, it has averaged more than 4 million visitors per year, ranking it among the most-visited amusement parks in North America. The park features over 40 rides and attractions, including ten roller coasters.