A´RSIA
A´RSIA a small river of Istria, still called
Arsa, which became the boundary between Italy and Illyricum, when Istria had been annexed by Augustus to the former country. (
Plin. Nat. 3.5. s. 6,
19. s. 23; Tab. Peut.) Florus represents it as having been at an earlier period the limit between the Illyrians and Istrians (2.4).
It flowed into the Flanaticus Sinus (
Golfo di Qeuarnero), on the E. coast of Istria, just beyond the town of Nesactium (
Castel Nuovo).
The existence of a town of the name “Civitas Arsia,” rests only on the authority of the geographer of Ravenna (4.31), and is probably a mistake.
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E.H.B]