Longus
Longus in North Britain, mentioned by Ptolemy (2.3) as a river to the north of the Epidian Promontory (Mull of Cantyre). Identified in the Monumenta Britannica with Lynneloch, Innerlochy, and Loch Melfort.
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.