The document summarizes a folklore from the Toba Lake region in Indonesia. It tells the story of a man who caught a large golden fish that transformed into a beautiful princess. They married on the condition that he never reveal she was once a fish. Years later, in anger he broke his promise by calling his daughter "the daughter of a fish". The princess cried and warned their daughter of an impending disaster. An earthquake and heavy rains then flooded the area, forming Lake Toba. The princess turned back into a fish and the man became the island of Samosir in the middle of the lake.