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Wiktionary
nahuelito

n. (context in Argentina cryptozoology English) A large aquatic creature, similar to the Loch Ness monster, which supposedly lives in Nahuel Huapi Lake, Argentina.

Wikipedia
Nahuelito

Nahuelito is a lake monster reported to live in Nahuel Huapi Lake, Patagonia, Argentina. Like Nessie, the Loch Ness Monster, the Argentine creature is named after the lake she resides in and has been described as a giant serpent or a huge hump, as well as a plesiosaur. Nahuelito has been allegedly shown through photos showing a hump, or a serpentine body.