A dohyō is a sumo competition space. In professional sumo, the circular fighting boundary sits within a larger earthen platform. The platform’s outer edge is not the boundary that a wrestler must cross to lose.
01
The dohyō in a bout
The circle within the platform
The fighting boundary and its markings
A · Fighting bales: the ring is 4.55 m in diameter.
B · Toku-dawara: one outward-offset bale at each of four points.
C · Starting lines: in professional sumo, 90 cm long, 6 cm wide and 70 cm apart.
D · Janome: a sand strip about 25 cm wide, smoothed between bouts to reveal traces.
A plan of the ground markings only; platform steps, ringside equipment and the suspended roof are omitted.
The professional fighting ring is 4.55 metres across, marked by partly buried straw bales. Four bales, known as toku-dawara, are offset slightly outward at the front, back, east and west. The platform continues beyond the fighting boundary, so a wrestler can lose without falling from its edge.
A platform is not essential to every ring
The professional association’s rules describe a public ring on a sloping-sided earthen platform 34–60 centimetres high and 6.70 metres on each side. A practice ring can instead have the same 4.55-metre bale circle set into level ground. The raised platform and the fighting boundary do different jobs: a bout is decided at the bale edge, well before the outer edge of the platform.
Contact decides the result
In an ordinary finish, a wrestler loses by touching the ground outside the bales first, or touching the ground with a body part other than the soles. Other rules and exceptional finishes also apply. A foot resting on a bale, or a body leaning beyond the circle, is not itself contact with the ground outside. Gyōji Kimura Ginjirō explains that a foot still on the bale can disturb the surrounding sand while the heel remains raised. Flying sand alone does not establish the decisive contact.
Lines for starting, sand for traces
The two white shikiri lines position wrestlers before the bout. In professional sumo they are 70 centimetres apart, each 90 centimetres long and 6 centimetres wide. Wrestlers may start farther back, but not across their own line. Outside the ring, yobidashi smooth the roughly 25-centimetre-wide janome sand strip between bouts. Footmarks can help establish whether a wrestler stepped out; the strip is not a second fighting area.
Who sits outside the circle?
The tamari below the platform provide places for judges, waiting wrestlers and waiting referees. Five judges sit at the front, east, west and the opposite side beneath the red and white tassels. Waiting referees also sit on that opposite side; their seats should not be confused with the referee conducting a bout above. From the designated front, east is left and west right. These are arena directions, not necessarily geographical bearings.
02
Construction and change
Building a firm surface
1. Filling earth. A regional-tour construction report, Yokohama sports association.2. Compacting. A regional-tour construction report, Yokohama sports association.3. Fixing the bales. A regional-tour construction report, Yokohama sports association.4. Painting the starting lines. A regional-tour construction report, Yokohama sports association.
Yobidashi announce wrestlers and also build and maintain the ring. A Yokohama sports-association report, made with the Japan Sumo Association’s cooperation, follows construction at a regional tour. Workers prepared a supporting base, compacted the clay-rich Arakida earth specified in the report, marked the circle, cut grooves and fixed the bales before painting the starting lines. Firm earth provides footing; the bales create a low, tangible boundary. The white lines are painted rather than made from raised wooden strips. The tour’s portable supporting base is a feature of that example, not a foundation used everywhere.
Before the modern circle
The Japan Sumo Association estimates that the ring formed between the late seventeenth and early eighteenth centuries. Its museum identifies visible, unburied bales in a sumo picture by Hishikawa Moronobu dated 1661–1680. Early rings could be square as well as circular; circles became predominant around the mid-eighteenth century. That was not a simultaneous nationwide change: Nanbu sumo around Morioka retained square rings into the early Shōwa period. A ring’s history therefore concerns the development of a marked boundary as well as its later dimensions.
A boundary with a history
Starting lines and time limits were introduced in 1928. In 1930, officials moved from the platform to seats below, improving spectators’ sightlines. In April 1931, the fighting circle grew from 13 to 15 shaku, or 4.55 metres. Sand between the circles of the earlier double ring had been called janome; that name survived for the outer sand strip. In 1952, four roof posts gave way to a suspended roof and coloured tassels. Starting procedures, boundaries, officials’ positions and the overhead structure changed in separate stages.
03
Ritual and symbols
The ring’s pre-tournament rite
A professional dohyō beneath its suspended roof. Detail from the Japan Sumo Association’s 2014 brochure.
A senior gyōji officiates at the dohyō festival, offering prayers and provisions for safety and a successful tournament; offerings including salt and kelp are placed at the centre. Compaction and bales prepare the physical ring, while the rite marks another aspect of its readiness. Construction photographs should be read accordingly: painting starting lines is a building task, not itself the festival.
What do the four tassels represent?
The association relates the blue-green, red, white and black tassels to spring, summer, autumn and winter and to the four guardian figures of dragon, bird, tiger and tortoise. They hang at the four roof corners. Their ritual interpretation and their use as visible points of reference are distinct aspects of the same objects.
Check your understanding
Does a wrestler have to fall off the platform to lose?
No. An ordinary finish turns on ground contact outside the bales, or contact with a body part other than the soles. Standing on a bale is different from touching outside it.
Has a wrestler necessarily lost by standing on a bale and leaning outside?
Not necessarily. Ordinarily the issue is contact with the ground outside, or ground contact by a body part other than a sole, not simply a body extending through the air.
Does the ring’s east side necessarily face geographical east?
No. Arena directions are defined from the designated front: east is left and west right.
