According to the Russian State Water Registry refers to the Irtysh basin district, water management section of the river - Ishim from the Russian border with the Republic of Kazakhstan and to the mouth of the lake without Big Uvat, Uvat to hydro Large, river sub-basin of the river - Irtysh river basins tributaries to the confluence of the Ishim. River Basin - Irtysh, the Ishim River estuary is located on the left bank of the Irtysh River, on its 1016 km
