According to a Selk'nammyth the lake was created alongside the Strait of Magellan and Beagle Channel in places where slingshots fell on earth during Taiyín's fight with a witch who was said to have "retained the waters and the foods".[3]
Fagnano Lake, from north to south, in its Chilean part
References
Wikimedia Commons has media related to Lake Fagnano.
^Montecino Aguirre, Sonia (2015). "Canal de Beagle". Mitos de Chile: Enciclopedia de seres, apariciones y encantos (in Spanish). Catalonia. p. 125. ISBN978-956-324-375-8.
Niemeyer, Hans; Cereceda, Pilar (1983). Geografía de Chile — Tomo VIII: Hidrografía (1º edición, Santiago de Chile: Instituto Geográfico Militar ed.).