Dohyō

A dohyō (土俵, Japanese pronunciation: [doçoː]) is the space in which a sumo wrestling bout occurs. A typical dohyō is a circle made of partially buried rice-straw bales 4.55 meters in diameter. In official professional tournaments (honbasho), it is mounted on a square platform of clay 66 cm high and 6.7m wide on each side.