Landscapes r. Daugava. Types of the city of Daugavpils, industrial enterprises. After sailing along the river on rafts, on kayaks. Dolomite mining. Landscapes of the river Perce. Kegums HPP. Sanatorium "Ogre". Types of Riga: streets, buildings. Fishing in the river. Daugava, canned food production. Work in the port of Riga.