Biotope Pra 'delle Nasse - Trentino

Biotope Pra 'delle Nasse - Trentino

Type of protected area - Where it is located

Typology: Biotope; established with Resolution of the Provincial Council of 10 January 1988 n. 60.
Region: Trentino-Alto Adige
Province: Trento

The Pra delle Nasse biotope is located near San Martino di Castrozza, near La Segheria, at 1,470 meters above sea level and covers an area of ​​about 25 hectares. The peat bog belongs to the water catchment area of ​​the Cismòn torrent in eastern Trentino.

Villa Welsperg - Paneveggio-Pale di San Martino Park - Pra delle Nasse (photo


The Prà delle Nasse peat bog was formed by filling the vegetation of an original glacial lake. At first superficial glance the peat bog appears as a meadow that opens up inside an ancient spruce forest that surrounds it only in part. At the edges of the peat bog you can see a hygrophilous broad-leaved belt, among which dominates far white. True white alder groves are found along the course of the Rio Brentella and especially in the western end of the peat bog where the river flows into it. The Prà delle Nasse acquires considerable interest due to the rarity of surviving wetlands in the Dolomites: in fact, many peaty, marshy or river ecosystems have also been destroyed in these alpine valleys, to make way for meadows or human settlements or structures. The whole peat bog is crossed by what can be called the main course of the Rio Brentella, the inlet and outlet of the Biotope. Unfortunately, the original wetland area has been greatly reduced by human intervention: part of the peat bog has been filled to create a square and a parking lot. The intervention of the Province of Trento was necessary to save the residual portion of the wetland.

Flora and fauna

The wetland is colonized by sphagnum moss (particular swamp mosses) which over the centuries, developing and depositing, have gradually formed the peaty layer. Above the peat live particular hygrophilous species, specialized for this low nitrogen and humid environment: Drosera spp., Pinguicula spp., Marsh potentilla, marsh parnassia, cotton grasses, orchids and sedges.
The fauna consists essentially of amphibians: salamanders, newts, frogs and toads.


The provincial law (Autonomous Province of Trento) that established protected Biotopes (areas of significant naturalistic, scientific and cultural interest) is No. 14 of 23/06/1986. In 1987, 287 were identified: of these, 219 are defined as being of local interest and their establishment and management is a municipal responsibility (municipal biotopes); the 68 most important are instead classified of provincial interest (provincial biotopes), and are the responsibility of the Biotopes Office of the Parks and State Forests Service of the Province.

Information for the visit

In the biotope, a didactic path (journey time about 2 hours) was created with various illustrative panels; it is advisable to start the path at the entrance of the biotope, which starts from the Laghetti di SAn Martino di Castrozza area near the Visitor Center of the Paneveggio-Pale di San Martino Natural Park and to continue in the direction of travel suggested by the tables.

How to get
From Trento take the Valsugana state road, then deviate to Fiera di Primiero and San Martino di Castrozza.

Parks and State Forests Service of the Autonomous Province of Trento
North Business Center - Via Trener, 3
38100 Trento
Tel. 0461 495833

Video: Valsugana, Trentino, Italy (October 2021).