Matsudo Velodrome
Matsudo Velodrome is a velodrome located in Matsudo, Chiba that conducts pari-mutuel Keirin racing - one of Japan's four authorized "Public Sports" where gambling is permitted. Its Keirin identification number for betting purposes is 31#.
Matsudo's oval is 333 meters in circumference. A typical keirin race of 2,015 meters consists of six laps around the course.