It covers the Quetrihué Peninsula on the shore of the Nahuel Huapi Lake in the province of Neuquén, 3 km (1.9 mi) from Villa la Angostura.

Even though arrayán trees (Luma apiculata) can be seen on the way to the end of the peninsula, the forest of 300-year-old arrayanes covers 0.2 km2 (20 ha) of the southern point, with individuals of over 600 years.

The forest can be reached by boat from different points of the Nahuel Huapi lake, or a 12 km (7.5 mi) path from the beginning of the park at the port of Villa La Angostura.

There are a few pudú and huemul deer, guanacos, monitos de monte, and small foxes.

Even though it was already part of the Nahuel Huapi National Park, Los Arrayanes was created in 1971 to protect its forest of rare arrayán trees.