Hatun Mach'ay, Archaeological site in Recuay Province, Ancash Department, Peru.

Hatun Mach'ay is a rock forest with archaeological remains on the western side of the Cordillera Negra, in Pampas Chico District, Recuay Province, Ancash, at about 4,200 metres above sea level. The site covers 423.9487 hectares and its stone figures reach up to 83 metres in height. It was declared a National Cultural Heritage on 7 May 2010.

The caves contain rock carvings and paintings dating back roughly 10,000 years, revealing signs of early human settlement in this region. These artworks provide insight into the artistic traditions and daily practices of ancient peoples who inhabited these high mountain areas.

The name Hatun Mach'ay comes from Ancash Quechua: hatun means big and mach'ay means cave, so it can be read as "big cave". The site was declared National Cultural Heritage by Resolución Directoral No. 944/INC-2010 on May 7, 2010, a status that recognises the rock formations together with the archaeological remains found among them.

A shelter building on site provides accommodation for multiple visitors with kitchen access, beds, and bathroom facilities along with camping areas for longer stays. The high altitude and remote location require good physical fitness and proper mountain gear to navigate the terrain safely.

The rock forest covers 423.9487 hectares, and its stone figures reach up to 83 metres in height. More than 200 bouldering routes run across these formations, and the site was declared National Cultural Heritage by Resolución Directoral No. 944/INC-2010 on 7 May 2010.