Question: Muay thai is native to what area?
About the article "Thailand", section "Sports".

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Muay Thai has fixed its weight division similarly to boxing.
International Kickboxing Federation (IKF): Muay Thai Welterweight (Pro & Amateur) 142.1 lbs.
- 147 lbs.
(64.59 kg - 66.8 kg)  World Muay Thai Council (WMC), welterweight range is from 140 pounds (63.5 kg) to 147 pounds (66.6 kg) World Muay Thai Federation (WMF), the official amateur organization, fixed welterweight from 63.5 to 67 kg for adult; the Junior category is the same as adult  
Tomoi is an unarmed offensive martial art from Malaysia practiced mainly in the northern states of Kedah, Trengganu, and especially Kelantan.
It is closely related to other Indochinese boxing styles such as muay Thai in Thailand, pradal serey in Cambodia, muay Lao in Laos and lethwei in Myanmar.
Practitioners are called "petomoi".
The word "tomoi" is a cognate of the Thai "dhoi muay".
This was originally used for pugilism in general, and usually referred to what is now called muay boran or "ancient boxing".
In modern Thai it denotes western boxing.
In Malaysia, however, "tomoi" has always referred to the indigenous Southeast Asian tradition of kickboxing while the general term for pugilism is "tinju". 
Nakamoto began fighting Muay Thai professionally in 2005.
She is an eight-time world champion in the sport.
Having produced a perfect 16-0 record to date. 
The traditional martial arts of the Indochinese peninsula are related among one another, and as a group to southern Chinese and Indian martial arts.
The most salient common feature is '"Indochinese kickboxing.
Khmer Pradal Serey – Possible predecessor of Muay Thai with an emphasis on elbow techniques.
Siamese Muay Boran (Ancient Boxing) – Predecessor of Muay Thai, allows the use of headbutts.
Thai boxing or Muay Thai – The modern Thai martial art with strong emphasis on knee and elbow strikes.
Burmese Lethwei – Traditional kickboxing from Myanmar emphasising knees, elbow strikes, headbutt, punch, and kicks.
Laotian Muay Lao – Lao kickboxing Malay Tomoi – kickboxing style from northern Malaysia, descended from the older muay boran.  
At age 7, Somluck began training and fighting in Muay Thai.
At 11, he moved to Bangkok to fight in the bigger stadiums.
Despite never winning a major title in Muay Thai, he is considered to be one of the greatest Muay Thai fighters of all timeneeded, although he has never won outside of his native Thailand.
He was ranked #1 at both Lumpinee Boxing Stadium and Rajadamnern Boxing Stadium, but Promoters of the champions at his weight would not let Somrak fight them because they knew he was too good.
Because of this he switched to amateur boxing.
He beat fellow legend Jomhod Kiatadisak on October 4, 2012 at Rajadamnern Stadium in a fight with the largest ever side bet in Muay Thai, 5.27 million baht on the line.
They fought again in December 7, 2012 on the Lumpinee stadium birthday show.
This time Jomhod Kiatadisak won by points.
They fought third match with a 6 million baht side bet on February 7, 2013 and Somluck won again by decision.
However, he lost to American Nak Muay Chike Lindsay by unanimous decision in a modified Thai boxing "Push Kick: World Stand Off" in Pomona, California, on March 2, 2013.