Sinonia
Sinonia (Zannone), was the name given in ancient times to the smallest of the three islands known as the Isole di Ponza. It is situated about 5 miles to the NE. of Pontia (Ponza), the principal island of the group (Plin. Nat. 3.6. s. 12; Mel. 2.7.18).
From William Smith (ed.), Dictionary of Greek and Roman Geography. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.