In addition to working in the fields, he likes to go to the river not far from his home for fishing. Easily he can fish, because in addition to the many fish, the river and the water is clear.
Once upon a time, he went to the river for fishing. But after a while, none of the fish he got. He was surprised, because this is the first time it was difficult to get fish. Eventually he
was annoyed and decided to stop fishing. However, when he was about to pull his fishing rod out of the way, there were fishes that grabbed the rod. Toba who was upset to feel happy, because the fish who grabbed the fishing rod is a fish that is so big. After a while, he finally managed to lift the fish to the mainland. When he released the fish from the hook, the fish looked at Toba carefully and meaningfully.
After the fish is placed somewhere, he takes a bath in the river. Toba was delighted to have such a huge fish, with the occasional smile of imagining how good it would be if it were burned later.
After arriving home, he also prepares firewood to roast the fish. However, how surprised he was, if it turns out the fish was not in place. He was amazed when he recalled that he found some gold pieces near the place where the fish were kept while in the river. Finally he decided to go into the room. However, after he entered the room, he was surprised for the second time because in the room there was a woman who was facing the mirror while combing his hair. Soon, the woman turned back and looked at the confused Toba. Toba is fascinated with the beauty of the woman.
The woman tells that she is the incarnation of the great fish that Toba catches in the river and some gold pieces that Toba finds, that is the scales of her body.
Day after day they pass. After a few weeks, Toba also wanted to apply for the woman. The lady receives Toba's proposal but on condition, Toba must swear that she will not bring up the origin of his wife who is the incarnation of a fish. Finally Toba swore.
Long story short, after marriage they are blessed with a boy named Samosir. Because Samosir is too spoiled by his mother, he becomes a lazy boy and his behavior is not good enough.
After he was big enough, his mother always told Samosir to deliver rice to his father who was working in the field. But whenever his mother asks, he always refuses his mother's request.
Until one day, his mother told again Samosir deliver rice to his father in the fields. At first Samosir refused but his mother continued to force it, finally Samosir went away with annoyance. In the middle of the journey, Samosir also feel hungry, he finally ate some rice and side dishes. After arriving in the fields, Samosir gave rice and side dishes to his father.
Because Samosir came late, Toba was starving and immediately opened the place rice. Toba was shocked and angry to see the remains of food given to him. His anger culminated when Samosir confessed he was the one who ate it. Toba got angry and hit Samosir while saying: "You know, you're a descendant of a lady of a fish ....!" Hearing his father's words, Samosir went home with tears. And he complained to his mother, that his father beat him while telling everything his father said. Hearing the story of his son, the mother was very sad, especially her husband had violated his oath first by saying through slur on his son.
Ibunyapun immediately told Samosir to go to the hill and climb the tallest trees that are there. Soon the mother went to the river. Once up the river, lightning struck by a thunderous roar, then he jumped into the river and turned into a fish again. The rain fell down very heavily, and there was a great flood. Toba was flooded by water and could not save himself.
The longer the water widespread, thus forming a lake that is so large that we now know the name "DANAU TOBA", while the island is in the middle of the lake is 'ISLAND ISLAND'.