Khentii aimag, named after the Khentii Mountains, is located in the east of the country, bordering Russia in the north. It has an area of 80,325 km² and a population of around 70,000, mainly Khalkha Mongols, but with a minority of Buriad (Buryat) people in the north.
This is the birthplace of Temüjin, or Genghis Khan, at Deluun Boldog, about about 3.5 kilometres north of the village of Dadal. On the hill at that place is a monument, built in 1990 to commemorate the 750th anniversary of the writing of "The Secret History of the Mongols". The inscription, in classical Mongolian script, states that in 1162 Chinggis Khaan was born there.
Dadal is a nice place of mainly Buriad people who live in log huts rather than gers. There are rivers, lakes and forests; Apart from Genghis Khan's birthplace, Deluun Boldog, there is Khajuu Bulag, a mineral water spring where he is supposed to have drunk. About 5 kilometres from Dadal is the home of Zundui Dagva, a hunter in his nineties who has filled his Hunting Museum with many stuffed animals he shot, including snow leopard, wolf and bear.
Its capital is Öndörkhaan, a small town with on its southern part the Kherlen river with a recently renovated Buddhist Monastery nearby. Another monastery, Shadavdarjaliin Khiid, was originally built in 1660 and housed up to 1000 monks; but in 1938, during the terror of the purges, all monks were arrested and eventually, in the 1950s the buildings were demolished. It has now been rebuilt and houses about 15 monks. Öndörkhaan has an Ethnography Museum, housed inside the 18th-century home of the Tsetseg Khaan, a Mongolian prince who governed most of eastern Mongolia during the Manchu reign. There is a beautiful ceremonial ger with wonderful wood furnishings. Nearby is a statue of Genghis Khan and a small Aimag Museum.