River
Fluvius Arsia
Raša
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The Raša, a small river on the Istrian peninsula in Croatia, is the Arsia of the Romans. The Roman writer Pliny called it the present boundary of Italy, and from 16 BC until the reign of Marcus Aurelius it divided Italy from Dalmatia. The map makes the most of that role: it draws the river as the continuation of a nameless brown mountain range, cutting Istria off from the mainland, although in reality it flows through the peninsula. The draughtsman apparently confused the political border with a natural one. Where the road crosses the river, a road station named after it probably marks the bridge.