 The 2011 Puyehue Volcano eruption polluted the Golgol River, a source of the lake, killing fish.Pyroclastic material reached Puyehue Lake through river transport, which resulted in the deposition of a layer of volcanic ash at the bottom of the lake.In the 16th century the lake was known to the Spanish as "Llobén", from the Huilliche word of "llofën" meaning "abundant and continuous rain."