Presidente Ríos Lake spans the border between the park and Las Guaitecas National Reserve.

Average annual rainfall at Cabo Raper (lat 46°50' S.), on the open coast of the Taitao Peninsula, is about 2,000 mm (79 in).

Going eastward, the amount of precipitation increases in the sheltered areas of the Chilean Inside Passage, being similar to that of Los Lagos Region.

The average annual precipitation recorded between 1981 and 1985 at Laguna San Rafael weather station (lat 46°37' S.) was 4,440 mm (175 in).

Several species of birds find shelter in the park, including black-browed albatrosses, great grebes, black-necked swans and cormorants.