Khogno Khan Mountain is a 470 sq km nature reserve, in Gurvanbulag soum of Bulgan province, and is one of the legendary mountains in the history of Mongolia. Here are the remains of the "Khogno Tarni" monastery in the Khogno Khan Mountain, which was built in the 17th century. The mountain is rich in flora and fauna and was the venue for many historical events. The area is a beautiful combination of sand, steppe and mountains. In 1688 Galdanboshigt destroyed the monastery and tied the lamas up with ropes, whence comes the name "Khogno Khan" - 'khogno' means 'tied with ropes.' Khugnu-Tarni is a protected national park in the Bulgan province of Mongolia.