Map of the Elaver by T.A. Dodge

Map of the Elaver (Allier) river which Caesar and Vercingetorix both traveled along on the way to Gergovia (Caesar's Gallic War 7.35). From Theodore Ayrault Dodge, Caesar: A History of the Art of War Among the Romans Down to the End of the Roman Empire, with a Detailed Account of the Campaigns of Caius Julius Caesar (Boston: Houghton Mifflin, 1892), p. 250.