Carlos Anwandter Nature Sanctuary, Nature sanctuary in Mariquina, Chile.

The Sanctuary Río Cruces y Chorocamayo is a nature reserve covering wetlands, rivers, grasslands, and forest areas in the Los Ríos Region. The landscape consists of expansive swampy zones crossed by waterways that create diverse habitats for wildlife.

The site originated from a major earthquake in 1960 that flooded extensive territories and shaped the current landscape. From this catastrophic event, an important ecosystem developed that was eventually placed under protection.

The sanctuary is named after Carlos Anwandter, a German politician who settled in Valdivia in 1850. Its Ramsar listing in 1981 made it Chile's first wetland of international importance, and a management plan funded through the Ramsar Convention was introduced by CONAF in 2016.

Visitors can enter the reserve at designated access points in Valdivia or Mariquina and explore the grounds on walking paths. It is advisable to bring sturdy footwear and weatherproof clothing, as many areas are swampy and wet.

The area is known for a remarkable concentration of black-necked swans that live and can be observed under protected conditions. These waterfowl are particularly attractive to birdwatchers and characterize the appearance of the waterways.