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Yasothon (Thai: ยโสธร) is a city in the Isan region of north-eastern Thailand and the capital of the province of the same name. It lies a little more than 500 km northeast of the Thai capital Bangkok.
The population of Yasothon in 2005 was 21,600.
Bun Bungfai (บุญบั้งไฟ), or the Yasothon Rocket Festival is held annually in May at Phaya Thaen Park. The festival's origins lie in a custom of firing fireworks into the sky at the start of the rice-growing season to encourage rain.
The festival now takes the form of a competition to see whose rocket will stay aloft for the longest time. The competition is marked by a day of highly-decorated floats parading through the town accompanied by partying, dancing and music.
In 1999, the Yasothon Rocket Festival made world headlines when a 120 kg rocket exploded, killing five persons.
Yasothon lies on Route 202; there are no rail or air connections.