Access coming from:

- Alcanena (± 19.2 km) by N365 to Moitas Vendas. Turn left to Fonte street and follow to António Galveias Dias street  to Barrinhos. There, take Joaquim Maria Batista street to Serra de Sto. António. Follow to Telhados Grandes / S. Bento. There take Alto street  and Casal de Sto. António street;

- Porto de Mós (± 13.7 km) by N362 to Serro Ventoso. There, follow to Pebada street and Principal street to Casal de Santo António street to Azelha.

Access only on foot. Private property.

GPS: 39.525145, -8.806107

South of Chão das Pias depression and near the village with the same name, is this area where you can see several sinkholes delimited by stone walls, having the bottom covered with fertile soil (terra rossa) and dotted by lapiaz in several sizes giving the landscape a distinctive look.

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.

Lapiaz or karren field - common landscape in limestone areas, with many grooves due to the dissolution of limestone by rainwater along fractures and cracks.

Terra rossa – Italian expression meaning “red soil”. The terra rossa soil is heavy and clay-rich (silty-clay to clayey) soil, strongly reddish, developed on limestone or dolomite.