The sinkhole's name 'Aines' is linguistically linked to ancient local folklore suggesting it was a place where spirits gathered.
The microclimate within the sinkhole creates a temperature inversion, allowing for distinct plant species to grow compared to the arid plains above.
It was formed by the dissolution of subsurface evaporite rocks, a common geological process in this specific area of the Moncayo foothills.
The sinkhole measures approximately 30 meters in diameter and reaches significant depths, though it is not accessible for entry.
Grisel, the village closest to the site, has integrated the preservation of the sinkhole into its local heritage and tourism initiatives.
Pozo de los Aines is a unique geological sinkhole located near the village of Grisel in the Moncayo region of Zaragoza. The site features a deep chasm formed by the dissolution of gypsum and limestone strata, resulting in a vertical, circular opening surrounded by lush vegetation. It is historically associated with local legends of mystery, often referred to as the 'well of the spirits.' The area is enclosed by protective fencing to ensure visitor safety while allowing observation of the hole's distinct microclimate. The surrounding landscape consists of Mediterranean scrub and agricultural fields typical of the Ebro Valley borderlands. The site serves as a prime example of karst topography in the province of Zaragoza.
The designated observation balcony, which offers a direct, safe view down into the circular abyss.
Wear sturdy walking shoes as the terrain surrounding the observation point is uneven and gravelly.
Bring binoculars if you wish to observe the inner wall vegetation and bird life nesting within the sinkhole.
Combine your visit with a short walk through the streets of Grisel to see traditional Aragonese architecture.
Do not attempt to descend into the sinkhole, as the walls are unstable and the descent is dangerous.
Do not climb over safety railings; remain on marked paths to avoid soil erosion and potential ground instability.
