Boiúna (translated as "Black Snake") is a mythological creature in Brazilian mythology. It is also known as the Cobra-Grande (translated as "Large Serpent") and the Mboiaçu.
The Boiúna is a nocturnal black snake creature which is the most powerful creature of the rivers within the Amazon rainforest. It can take on various shapes in order to frighten away any fishermen that enter its territory. Some of the forms the Boiúna can take on are a canoe, a sailboat, a transatlantic, and a woman.
The Boiúna appears in The River (U.S. TV series). Initially the Boiúna was portrayed as an uncharted stretch of the amazon river that curves through the jungle like a snakes coils and is home to all manners of paranormal occurrences: “The further we go up the Boiúna, the further the laws of physics breaks down” as one character states. Later it is revealed that the Boiúna is actually the evil life force of the river itself and the series ended with the very river itself changing shape to prevent the characters from leaving, trapping them in the jungle for all eternity.
The Boiúna appears in AdventureQuest Worlds. This version of the Boiúna is a recolored version of Sneak. It is among the creatures that attack Terra da Festa before the Carnaval Party.
