Polje-type karst structure in the dolomites of Serra da Picavessa, approximately 4 km long in east-west orientation and 500 to 1000 meters wide north-south, with a flat bottom filled with terra-rossa, very suitable for agriculture.

The northern flank of the polje is delimited by an important reverse fault, which puts the dolomites in contact with the Lower Jurassic limestones. The polje has a wider area in its eastern part where water flows and where a temporary lagoon is formed during rainy periods. There one can find several arthropods characteristic of temporary ponds. The surroundings of the polje have more karst structures such as lapiás and sinkholes.