The
Tuul River or
Tula River (, ; in older sources also
Tola) is a river in central and northern
Mongolia. Sacred to the
Mongols, the Tuul is generally called the
Khatan (Queen)
Tuul in Mongolian. It is 704 km long and drains an area 49,840 square km. The river is called the "Duluo river" in the
Book of Sui, a Chinese historical work completed in 636 AD. The
Secret History of the Mongols (1240 AD) frequently mentions a "Black Forest of the Tuul River" where the palace of
Wang Khan was located. The
Ming dynasty (1368–1644) was established by the progressive expulsion of the Mongol Empire from China. After capturing Beijing, the Ming's founding
Hongwu Emperor defeated the Mongols at the Tula River in 1372, driving them back to the
Orhon River. The following
Hongwu Emperor would find it necessary to defeat the
Oirats at the river Tula again in 1414.