This Sanctuary is located in Puntilla Capilla el Mármol, surrounded by the waters of Lake General Carrera. As its name indicates its main characteristic are the outcrops of marble, which are found along a coastal strip of 300 meters in length. Geographically it is located at 46 ° 39 '30 "of South Latitude and 76 ° 37' 30" of West Longitude, at an altitude of 350 meters above sea level, with an approximate area -according to the decree- of 50 hectares. The climate of the area presents an average of 950 mm of rainfall distributed throughout the year. The geological resource is the most relevant feature in this Sanctuary, both in the sector of Puntilla el Mármol, and in many points of the group of islands called Panichini. However, this geological resource reaches its highest scenic value in the place known as "Capilla de Mármol", due to the pounding of the water from General Carrera Lake, which has carved cavities and caves in the marble, generating a unit of great tourist attraction. The stone appears in massive bodies and presents diverse tonalities of color according to its content of impurities, although the banks of white color, of great purity predominate. It is also possible to find blue and pink marble benches due to the presence of other mineral elements. The marble banks represent a deposit of 5000 million tons of marble with a law of 94% calcium carbonate (Institute of Geological Research). The Sanctuary is located within the Mixed Evergreen Forest Formation of the Baker (According to Gajardo, 1983), however, the vegetational resource of the sector has been considerably altered by overgrazing and because of forest fires. In the Puerto Tranquilo area there is a jetty to develop tourist circuits in boats to the outcrops of marble, associated with housing and food services. In the Sanctuary there are no human settlements, and the places surrounding the marble benches are destined to extensive livestock. (Consejo de Monumentos Nacionales de Chile)