Nonguén National Park, National park in Concepción Province, Chile

Nonguén National Park is a protected area in the Coastal Range with roughly 3,000 hectares of temperate forest featuring native tree species like Nothofagus obliqua and Cryptocarya alba. The terrain includes dense woodland with varying elevations and several walking trails for visitors to explore.

The area was declared a nature reserve on 30 December 2009, the fifth reserve in the Bío Bío Region. On 8 May 2020 it was reclassified as a national park, the first of its kind in a peri-urban sector of Chile. The reserve was created to fund protection, soil recovery and flora and fauna studies of the remnant Concepción deciduous forest.

The park protects one of the last significant deciduous forests in the region, serving as a vital refuge for local wildlife. This forest type shapes how the landscape appears throughout the Bío Bío area today.

The park is open Tuesday through Sunday with trail access until early afternoon, and visitors must depart before sunset. Those wishing to explore on foot should plan for daytime hours and wear sturdy shoes, as paths can be muddy and slippery.

The park's water is not only for wildlife: a catchment managed by ESSBIO draws about 6.9 million litres daily from the Estero Nonguén, supplying the commune of Penco and part of Concepción. The endangered shrub Berberis negeriana, known locally as michay de Neger, is endemic to the Bío Bío Region and grows within the park.