The Molino Grande oasis is located inside the Parco dei Gessi e dei Calanchi dell'Abbadessa (Park of Bolognese Gypsums and the Abbadessa Gullies) at Idice, 4 km from San Lazzaro di Savena, and consists of an hygrophilous grove along the Idice river, in the nearby of the ruins of an old watermill.

The oasis is a small protected area, but very representative of the surrounding river environment. It features a wetland, a small lake and a luxuriant section of forest where vegetation has grown free for over 20 years.

A path, about 2 km long, runs along the Idice river: a perfect place to spend some time in relax, between monumental trees and rare bird species like the bank swallow, the bee-eater and the kingfisher. The small lake is rich in biodiversity and hosts a rare species of water lily.