The wrestling ring

Sumo matches take place in a dohy a ring, 4.55 metres 14.9 ft in diameter and 16.26 square metres 175.0 sq ft in area, of rice straw bales on top of a platform made of clay mixed with sand. A new dohy is built for each tournament by the bout callers or yobidashi. At the center are two white lines, the shikiri sen, behind which the wrestlers position themselves at the start of the bout. A roof resembling that of a Shinto shrine may be suspended over the dohy.