Sumo matches take place in a dohyō (土俵): a ring, 4.55 metres in diameter and 16.26 square meters in area, of rice-straw bales on top of a platform made of clay mixed with sand. A new dohyō is built for each tournament by the yobidashi. At the center are two white lines, the shikiri-sen, behind which the wrestlers position themselves at the start of the bout.
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The ceremony starts by blessing of the ring. The wrestlers do a number of traditional moves. One is to spread their arms wide to show that they do not have any weapons. They bless the ring with salt which they throw around the ring.