Deluun Boldog is a hill with a monument on the top of it. Dadal somon. Legend says that when Chinggis qahan was born her mother was given a spleen soup and water of the soup was taken from the east lake, thus, east lake was given a name Deluun (Mongolian word for spleen), moreover, Chinggis’s body was wallowe in the west lake, thus, west lake was given a name Boldog (bulhdag-mongolian name for wallowing). Therefore, the names of east and west lakes called together as Deluun Boldog.