Phu Kao–Phu Phan Kham National Park (Thai: อุทยานแห่งชาติภูเก้า-ภูพานคำ) is a national park in Thailand's Khon Kaen and Nong Bua Lamphu provinces. This mountainous park, in two separate sections, encompasses part of the Ubol Ratana Dam reservoir and also features rock formations and waterfalls. The park is named for the Phu Kao and Phu Phan Kham mountain ranges of the Khorat Plateau.[