Along the Italian coasts there are lagoons, including the Venice, Grado Lagoon and Marano lagoons in northern Adriatic, and the Orbetello lagoon on the Tuscan coast. The swamps and ponds that in the past covered vast flat areas of Italy, have largely been dried up in recent centuries; the few remaining wetlands, such as the Comacchio Valleys in Emilia-Romagna or the Stagno di Cagliari in Sardinia, are protected natural environments.