Mount Nelly, Stratovolcano summit in Potosí Department, Bolivia.

Mount Nelly is a stratovolcano summit in the Cordillera Occidental range, rising to approximately 5,676 meters. The peak displays steep rocky slopes and volcanic rock formations that result from past eruption activity.

Mount Nelly formed through multiple phases of volcanic activity over geological time periods. Layers of solidified lava and ash build the mountain, revealing its volcanic origin.

The mountain lies in the Eduardo Avaroa Andean Fauna National Reserve, named after Eduardo Avaroa, a Bolivian figure killed in 1879 during the War of the Pacific. The reserve protects the high-altitude landscape around the peak, and the summit appears on Bolivian statistical maps as "Nelly", marked with a pink sun symbol near Laguna Verde.

Climbing Mount Nelly requires technical climbing equipment and high-altitude gear to move safely across the terrain. Local authorities at the Eduardo Avaroa Andean Fauna National Reserve issue permits needed for access.

Mount Nelly lies just north-east of the Licancabur volcano and beside Mount Laguna Verde, within the Eduardo Avaroa Andean Fauna National Reserve. The reserve is named after Eduardo Avaroa, a Bolivian figure killed in 1879 at the battle of Topáter during the War of the Pacific.