Cueva Negra, Montanejos, Archaeological cave site in Montanejos, Spain.

Cueva Negra is an archaeological cave in Montanejos with a main entrance about 26 by 10 meters wide, opening into a spacious underground chamber. Large stone blocks inside create a complex structure within the cave system.

The cave's most important excavations were carried out in 1934 by Joan Josep Senent, who documented ash beds from three ancient hearths, sandstone slabs used for grinding, river stones likely used as hammers, flint flakes and blades, and abundant pottery. All these remains were dated to the Neolithic. The absence of animal bones suggests only sporadic, temporary use, though experts do not rule out Palaeolithic occupation.

The blackened ceiling comes from fires that early inhabitants lit inside, suggesting they spent time there and used the space as shelter. This visible evidence reveals how prehistoric people adapted these natural caves for their needs.

The cave sits about 800 meters from Montanejos village and can be reached by hiking a steep trail. Sturdy shoes and adequate time are important for the uphill walk.

Speleologists have long searched for a passage from the cave to the Maimona ravine at a spot called the "Ventana del Caballo", but expeditions have never found it. The cave lies at about 637 m altitude, and its route drops roughly 30 m over 150 m.