[1] An approximation of Polybius 1.75.8-9; quoted from tau 305. This river, at the isthmus connecting Carthage to the rest of Libya, is better known as the Bagradas (or Macaras, Barrington Atlas map 32 grid E3); it is not otherwise attested as Boukaras/Bucaras.
References
F.W. Walbank, A Historical Commentary on Polybius, i (Oxford 1957) 140-1.