The Epsom Derby is one of the most prestigious horse races in the world, held annually in early June at Epsom Downs Racecourse in Surrey, England. Established in 1780, it is a flat race for three-year-old thoroughbreds and is part of the British Classics, which also includes the 1000 Guineas, 2000 Guineas, Oaks, and St. Leger. The race covers a distance of one mile and four furlongs, featuring a challenging course with significant elevation changes. The Epsom Derby is known for its rich history and has produced many legendary horses, making it a highlight of the horse racing calendar.