Cordillera Blanca Mountain range Peru. Huascaran National Park. Pastoruri Glacier The Pastoruri Glacier in the heart of the Cordillera Blanca mountain range in Peru. Despite its stature the glacier is receding having lost much of its size over the past years. This has led to dwindling numbers of visitors which in turn has led some local tour operators to give the chance for visitors to see climate change in action on the so-called Ruta del cambio climatico