AQUAE CUTILIAE, a mineral spring in Italy, near modern Cittaducale, 9m. E. of Rieti. The lake near it, supposed by classical writers to be the centre of Italy, was renowned for floating islands formed from partial petrification of plants by mineral substances in the water. Remains of baths may be seen ; they were apparently resorted to by Vespasian and Titus who both died there.