Usar
Usar the most easterly river of Mauretania. (Plin. Nat. 5.2. s. 1.) It seems to be the river called Σίσαρ by Ptolemy (4.2.10),and is probably the Ajebby, which falls into the gulf of Bugie.
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.