This is downloadable content (DLC) for the base simulator, Russian Fishing 4, requiring the main game to play. Released in 2020, this expansion introduces the Lower Tunguska River, a vast, new Siberian map characterized by its harsh beauty and abundant fish populations. Gameplay focuses on utilizing existing skills and gear to explore this large new environment, test new angling strategies, and target species unique to this tributary of the Yenisei. It offers a substantial new proving ground for dedicated simulation enthusiasts.