Ulgys is the Ket spirit-owner of the rivers and their fish, completing the triad of nature-masters that also includes the forest-master Kaigus and the game-mistress Kholai. Inhabiting the Yenisei and its tributaries, Ulgys is a benevolent but temperamental power over freshwater abundance; fishermen leave offerings of tea, tobacco, food and coins to keep the catch plentiful, while polluting or disrespecting the water invites scarcity and misfortune. Accounts vary on the being's gender, treating the river-owner at times as a masculine master and at times as a feminine source of plenty.