The Naranjo de Bulnes is a limestone peak dating from the Paleozoic Era, located in the Macizo Central region of the Picos de Europa, Asturias. Its name Picu Urriellu is believed to be derived from the term Los Urrieles, which is used to describe the Macizo Central. Naranjo de Bulnes is part of the Cabrales region of Asturias, and lies within the Picos de Europa National Park.