The competition area of judo is covered with mats and have a minimum of 14 x 14 m dimension. It is divided into two sections with the inner area of 8 x 8 m to 10 x 10 m called the contest area and an outer area of at least 3 x 3 m called the safety area. The mat is usually made of vinyl-covered foam and is called "tatami".

Credits: fujisports.com