The reserve consists of two sections that protect enclaves of native forest, which are home to several threatened and endangered species.

Los Ruiles reserve lies in the foothills of the Chilean Coast Range (Cordillera de la Costa), and has an area of 45 hectares.

Other dominant trees include Luma apiculata, Podocarpus salignus, Lithraea caustica, boldo (Peumus boldus), and Quillaja saponaria.

magellanicum, Ancistrodes genuflexa, Breutelia subplicata, Lembophyllum orbiculatum, Campylopus chilensis, Catagonium nitens subsp.

[3] The reserve is home to one of the northernmost populations of monito del monte (Dromiciops gliroides), a small marsupial which dwells in the mature forests of southern Chile and Argentina.