Mankhan Nature Reserve is a reserve in the western part of Mongolia. It is located south of Khar Us Nuur National Park in Khovd Province on the main road between Hovd City and Ulaanbaatar. Most of the area lies in the Mankhan sum. The reserve stretches over 3000km2 and has been created in 1993 together with Sharga Nature Reserve to protect the endangered Mongolian saiga. In addition to these antelopes, there are also goitered gazelles.