In Norse Mythology, Vimur is considered to be the greatest of all rivers, and the largest of the Elivagar rivers which were created at the beginning of the world.

The Skáldskaparmál states that Thor waded through this river along his journey to the stronghold of the giant Geirröðr, while Geirröðr’s daughter Gjálp tried to stop his attempts by causing the water to rise and the current to grow stronger.

It is said that the current of the river was so strong that it rose up to his shoulders.

Thor was able to overcome this challenge by hurling a rock into the river to stop the rising water.

He then used a rowan tree to cross the river.

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