This article described it as "the tovshuur, a Western Mongolian lute with two strings". See also tavshur, topshur, toshpulur, and doshpuluur, which are either closely related instruments or just different western transcriptions of the same origin word.
That looks like a dutar. It is a two stringed instrument found in central Asia from Iran in the West across to Western China in the East where it is played by the Uighurs. It can range in size between one and two meters.