Access coming from:

- Alcanena (± 23.5 km) by N361 and Alecrim street to Moinho street in Alcanede. Continue to Moinho street (direction quarries);

- Porto de Mós (± 85 km) by N362 to Mendiga. Follow to Barreiros street (direction quarries);

- Santarém (± 36 km) by N3 eand N362 to Alcanede. Take  N361 and cut to Cooperativa street, Principal street and road 5 de Outubro to Pé da Pedreira. Turn right to Moinho street and follow to the quarries.

Access to the doline only on foot. For safety reasons don’t come too close to the edge of the sinkhole. Private property.

GPS: 39.474075, -8.816350

This karst depression is the only known doline or sinkhole in funnel in Serras de Aire e Candeeiros Nature Park, having approximately 7 m in diameter and 7 m depth.

On the walls of the sinkhole can be seen a marked stratification, with alternations of compact calcareous from the Bathonian (Middle Jurassic) with good examples of cryoclasts that have their origin in the fragmentation phenomena originated by freezing and thawing.

This is an extremely vulnerable geossite, due to the proximity of quarries.

Bathonian – has this name because ir was defined in Bath. Stage of the middle Jurassic between 164 to 160 million years.

Bedding or stratification – layering occurring in rocks.

Cryoclast - rock fragment (clast) resulting from the breaking of existing rocks due to very low temperature.

Depression – landform sunken or depressed below the surrounding area.

Doline (also known as sinkhole) - a closed surface depression draining underground in karst landscape. Dolines are usually "bowl-shaped" and can have only a few or many hundreds of meters in diameter.

Karst - A distinctive topography that indicates dissolution of underlying soluble rocks by surface or ground water in areas of easily soluble rocks. Characterized by caves, underground drainage and sinkholes.

Limestone – from the Latin calcariu, relative to lime. Sedimentary rock composed of calcium carbonate.