土拉河
The Tuul River or Tula River (, "Tūl gol"; 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 long and drains an area of . The Secret History of the Mongols (1240 AD) frequently mentions a "Black Forest of the Tuul River" where the palace of Ong Khan was located.