The Oasis of the Vallette of Ostellato is what remains of the ancient valleys that surrounded the town, spared from the last reclamation of the Mezzano valley and today an oasis of wildlife protection.
They consist of 4 valley loops which constitute a biotope of a wetland of fresh water.
In the Vallette there are 150 species of aquatic birds, nesting.
You can see all kinds of herons, the great white, the gray and the red, numerous waders, including the Black-winged stilt, birds of prey, such as the marsh harrier, the buzzard.
The vegetation is typical of freshwater wetlands, characterized in the permanently flooded areas by reeds, white and yellow water lilies, flowering rush. On the banks there are white willow, water chestnut and elderberry.
The Oasis is well equipped for various activities such as bird watching, walking, cycling and horseback riding, sport fishing.
At the entrance there is also an astronomical observatory.
N.B. I would add a negative note: the final part of the Oasis is closed and not usable for about 6 km of path and there is an access price to the Oasis for both walking and cycling of € 2 per person.
Apart from the cost of the ticket which would certainly be worth the price for the beauty of the area, it is not acceptable to find rotten and decaying unused wooden bridges and piers with closed routes due to general neglect.