Marseilles, about equidistant from the Ebro, in Spain, and the Magra, which divides the Genoese and Tuscan territories. Being a small river, it has but a short journey to make. ↩

Buggia is a city in Africa, on nearly the same parallel of longitude as Marseilles. ↩

The allusion here is to the siege of Marseilles by a portion of Caesar’s army under Tribonius, and the fleet under Brutus. Purgatorio XVIII 101:⁠—

“And Caesar, that he might subdue Ilerda,

Thrust at Marseilles, and then ran into Spain.”