Campi Bisenzio - WWF Oasis Stagni di Focognano The Oasis of Stagni di Focognano is a protected natural area, founded in 1997. It is located on the border with the Municipality of Sesto Fiorentino. The Oasis covers 65 hectares and has swamps of both natural and artificial origin, the latter were created to cover the dump of Case Passerini. The natural area includes five ponds covering an area of 20 hectares.