Cerro del Nacimiento, Mountain summit in Catamarca Province, Argentina

Walter Penck, also called Cerro del Nacimiento, is a stratovolcano in the Cordillera Frontal of the Andes, in Tinogasta Department, Catamarca Province, Argentina, about 25 km from the Chilean border. Its summit, permanently covered in ice, reaches 6,436 m and has at least nine distinguishable peaks. It lies southeast of the multi-crater Tipas/Walther Penck complex, from which it is geologically independent.

The peak was named after a German geologist who conducted fieldwork in the Andean region during the early 1900s. This naming reflects a period when international scientists were actively studying South American mountain systems.

The name Walter Penck honours the German geologist Walther Penck, whose work on the Andes shaped early theories of mountain building. The neighbouring multi-summit volcanic complex also carries his name. The peak is often mislabelled Cerro Bayo on Argentine military topographic maps, an error that persists in some route descriptions.

Access to the mountain starts through the town of Fiambalá, where climbers should register with local authorities and arrange high-altitude gear. Before attempting the climb, gather information about current conditions and weather patterns at this elevation.

The summit is misnamed Cerro Bayo on some Argentine military geographic maps, an error that persists in older climbing literature. The volcano has at least nine distinct summits, and the Cazadero river, which gives it its name, rises on its eastern slope and flows north then east to the Chaschuil.