Jawaban:

Danau Toba

A long time ago, there was a man named Toba. One day, she fished on the river and got a fish. He was so surprised when that fish can talk and change into a beautiful girl. Then, Toba brought her home and marry her with the condition to keep her secret by not telling anyone where she come from. Toba agreed and they got married. A few years later, they had a son named Samosir. One day, Samosir asked to deliver some food to his father Toba, but on the way, he feel hungry and eat the food. Toba was angry and accidentally told that her mother was from a fish. Samosir then back home and told his mother about it. Soon after that, Toba and his mother disappeared and the land gave off the water and in a moment turned into a lake.