Mrassu

The Mrassu or Mras-Su (Мрассу́ or Мрас-Су́, Прас, Пырас, Пырас-суғ, Pras, Pьras, Pьras-suƣ) is a river in Kemerovo Oblast, Russia. It is a left tributary of the Tom (in the Ob's drainage basin), and has its sources in the Abakan Range. It is 338 km long, with a drainage basin of 8840 km2. The Mrassu joins the Tom near Myski.