Ammiana was a settlement in an archipelago in the northern part of the Lagoon of Venice which has disappeared. Its islands were part of a larger number of islands in this part of the lagoon which also included the island group of the next-door settlement of Costanziaco (just to the east) and the islands of Torcello, Burano and Mazzorbo to the south-east. The islands of Ammiana were between the right and left banks of the lagunar channels which today are called della Dolce and San Felice. Another island, which was called tumba della Leseda and is now called La Salina, which lies on the right (eastern) bank of the San Felice channel, was also part of this settlement.