The Nature Reserve, situated between Casalgrasso and Lombriasco, in the bag between the Provinces of Cuneo and Turin, covers an area of 178 hectares. Torrent Maira is the last big tributary of the river Po uphill Turin, and is characterized by a characteristic torrential course, with considerable changes in flow according to the season. Torrent Maira is delimited by willow and poplar woodlands and its waters are rich in barbels and other fish tracing the stream back above all during the reproduction period. The canal supplying the lake of Racconigi Royal Park derives from Maira, upstream the confluence with river Po. Within the Reserve, the course of river Po has been changed in several points with concrete prisms, in order to hinder the erosion of the cultivated fields. Despite this, not only the natural formation of meanders has been reduced, but the water speed has increased, causing the erosion of the river bed. From a naturalistic point of view, the most significant aspect of Riserva Naturale della Confluenza del Maira is represented by the vegetable formations of the banks and gravelly shores.
Confluenza del Maira Special Nature Reserve is safeguarded not only by the establishment law of River Po Park, but also according to the regional law no. 47 of 3rd April 1995 "Norme per la tutela dei biotopi", the Decision 85/338/CEE of 27th June 1985, and the Directive 92/43/CEE of 21st May 1992, since it has been considered as "ecological entity of great interest for the conservation of nature" and therefore subject to the environmental-landscape regulations according to law 8th August 1985, no. 431 and the European regulations, recognizing it as SCI – Site of Community Importance (code IT1110016).