The history of the formation of Lake Toba is quite unique
Once upon a time there was a fisherman named Toba. One day, he was fishing in the river. Suddenly he found a fish type a gold fish and took it home.
He was surprised when the fish talk and ask him not to eat  and change become a beautiful woman. Toba fell in love with her, they were married but Toba must be eligible when they have a children later, TOBA can not say that their child is a child fish. Toba meet her. They had a son named Naidoo. Toba switch jobs to "pangula" or farmer. Naidoo grew into a mischievous child.

However, when growing up, the boy is always hungry. Although many food and food he eat, he never feels full.

One day, being so hungry, he ate all the food on the table, including food rations of both parents. On his return from the field, fathers are hungry to find an empty desk there was no food, angry heart. With hunger and could not pull himself together, get out of abusive words.

" offspring of fish!"

He did not realize, with what he said, meant he had confided his wife.Immediately the boy went crying to his mother and asked if it was true he is the offspring of fish.

Hearing this, the mother was surprised that her husband had violated their oath earlier.

After that the mother decided to return to nature. Then suddenly the sky turned dark and the rain descended, lightning struck then by the swift.

The father became upset and very sorry for his actions. However, rice has become porridge. He could never be reunited with his wife and son and he loved it.

On the basis of ex-wife and his son, suddenly there springs gush. The water is getting bigger and bigger. Long into the lake. The lake is then we know today as Lake Toba.

Until now Lake Toba and Samosir island still famous, both name are used as he name one of the country district in North Sumatra.