Okay. I got this from the Volume 1 1990 edition of Muay Thai magazine which I purchased in Chiang Mai on the Great Temple Tour with Greg Nelson, Mike & Carol Walrath, and Master Chai's sisters. I missed lunch because the lady in the bookstore wanted to talk about KhaoSai Galaxy. "The size of the ring is between 5 and 7 metres, surrounded by a minimum of three ropes. The floor is padded with a soft material to a thickness of four centimeters with a top covering canvas."
From Muay Thai The Most Distinguished Art Of Fighting by Panya Kraitus:
"The ring must be square. The small size ring measures 20 feet (6.10 metres) each side and the big size ring measures 24 feet (7.30 metres) each side. The measurement is done by the inside of the ropes." And farther in the rules of the Sports Organization of Thailand, again in Panya Kraitus' book the ring "edge should protrude at least 70 centimeters from the ropes."
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