Iernus
Iernus in Ireland, mentioned by Ptolemy (2.2.4) as the most southern of two rivers (the Durus being the other) lying between the Senus (Shannon) and the Southern Promontory (Mizen Head)==either the Kenmare or the Bantry Bay River. [R. G. L.]
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.