Bolikhamsai (also Borikhamxay, Lao) is a province of Laos, located in the middle of the country.The province was formed in 1983 from parts of the Vientiane Province and Khammuan. In Khamkheuth district there is picturesque karst limestone scenery, which is allegedly the largest formation of its type in Southeast Asia. The province is also home to the Theun Hinboun Dam.