The Spöl or Aqua Granda is an Italian and Swiss river and is a tributary of the Inn.The source of the river is near Corno di Campo in the Province of Sondrio in Italy. It flows northeast past Livigno and into Lago di Livigno. It exits the lake at the Italian/Swiss border and flows northwest through Parc Naziunal Svizzer before emptying into the Inn near Zernez.Despite rising in Italy, the river is a tributary of the Inn, and the Danube, rather than of the Po.