Castiglione della Pescaia [kastiʎˈʎone della pesˈkaja], regionally simply abbreviated as Castiglione, is an ancient seaside town in the province of Grosseto, in Tuscany, Italy. The modern city grew around a medieval fortress (Italian: castello) and a large fishery, from which it acquired its designation. Today Castiglione is known mostly for its beaches, a vibrant nightlife, its nature, but also its majestic fortress and the uncontaminated natural reserve Diaccia Botrona, a swampy humid environment hosting unique wildlife, e.g. flamingoes, mallards and ducks.