Sayaboulyball

 is a provinceball of Laosball. It is known by many different names, such as Sainyabuli, Xayabuli, Xaignabouri, Xayaboury, Sayabouli, and Sayabouri. In area, it is the third largest in Laosball, covering 16,389 square kilometres. It borders. The province's name originates from the Sanskrit words sena (army) anpuri(city). It is a major area in the Lao Military's involvement of illegal timber trading.

History
The province was born as an, and remained undisturbed as part of Thailandball, until 1904 when  French Indochinaball Anschlussed it. It returned to Thailandball in 1941 as Lan Chang Province, until 1946 when it was returned to French Indochinaball.