Legend of Trentren Vilu and Caicai Vilu

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The legend of Trentren Vilu (Trengtreng or Tenten) and Caicai Vilu (Kaikai) is a Mapuche flood myth that tells the story of a fierce battle between two mythical snakes, Trentren Vilu (trentren="related with the earth", vilu="snake") and Caicai Vilu (Caicai="related to water", vilu="snake"). It explains how the Chilóe archipelago and mountains of southern Chile came to have its unique geography.