Delüün-Boldog is a tourist attraction located in Dadal, Khentii, in Onon-Balj National Park, Mongolia. It is one of several locations that is considered to be the birthplace of Genghis Khan (Temüjin), in the year 1162 CE, according to The Secret History of the Mongols. It is located near the sacred mountain Burkhan Khaldun and the Onon and Kherlen Rivers.
Onon-Balj National Park covers two sectors of the Onon River valley as it flows north from Mongolia into Russia. The region is in the transition zone between the Siberian conifer forests of the north and the Daurian steppe and forest-steppe of Mongolia. The area is one of relatively high biodiversity and is also historically and culturally important for its association with Genghis Khan. The park is located in the far northeast of Khentii Province, 280 km northeast of Ulaanbataar.