Lancahue is a protected area and watershed in the commune of Valdivia, Chile.

[2][3] The protected area host a relatively unscathed remnant of lowland (<300 m asl.)

[2] Part of the protected area contain secondary forest that started to develop after a fire around 1914, while other secondary forests originated from intense wood logging.

[4] The main tree species in Llancahue are Nothofagus dombeyi, Eucryphia cordifolia, Laureliopsis philippiana and Aextoxicon punctatum.

[5] The drainage basin of Llancahue is used for water supply in the nearby city of Valdivia.