akhtuba river bolshaya kokshaga river bolshoy cheremshan river bolshoy irgiz river chapayevka river cheboksary hydroelectric station cherepovets distributary drainage basin geographic coordinate system gorky reservoir ilet river ivankovo reservoir kama river kashinka river kazanka river kerzhenets river kostroma river kotorosl river kudma river kuybyshev reservoir latvian language malaya kokshaga river maly irgiz river mologa river moscow canal nizhny novgorod hydroelectric station oka river russia russian language rutka river rybinsk rybinsk hydroelectric station rybinsk reservoir samara river saratov hydroelectric station saratov reservoir selizharovka river sheksna shosha river sok river sura river sviyaga river tereshka river tsivil river tvertsa river uglich reservoir unzha river uzola river vazuza river vetluga river volga-baltic waterway volga-don canal volga hydroelectric station volga river vologda oblast yeruslan river zhiguli hydroelectric station