is a multi-purpose indoor arena located in Chuo-ku, Saitama City, Saitama, Japan. Its spectator capacity is 36,500 at maximum settings. This main arena capacity is between 19,000 and 22,500 when events such as basketball, volleyball, tennis, ice hockey, gymnastics, boxing, mixed martial arts, and professional wrestling take place there. It is also the only Japanese arena equipped especially for American football. The arena features a gigantic moveable section of seating which can reduce capacity for smaller events and create a more intimate setting.