Tömörbulag (Mongolian: Төмөрбулаг, iron spring) is a sum of Khövsgöl aimag.

The sum center, officially named Jargalant (Mongolian: Жаргалант), is located near the Bügsiin River, 75 south of Mörön and 714 km from Ulaanbaatar.

In 2004, there were about 133,000 heads of livestock, among them 76,000 goats, 44,000 sheep, 6,700 cattle and yaks, 6,200 horses and 41 camels.

As of 2007, the sum center is neither connected to the electric power grid nor to cell phone services.

M. Nyamaa, Khövsgöl aimgiin lavlakh toli, Ulaanbaatar 2001, p. 134f