Raša (river)
| Raša | |
| River | |
 Raška Inlet
|
|
| Tributaries | |
| - left | Krapanski Potok |
| - right | Karbuna |
| Source | Near Pićan, Croatia |
|---|---|
| Mouth | Raška Inlet |
| Length | 23 km (14 mi) |
The river Raša, (Latin: Arsia, Italian: Arsa) in Croatian Istria is a major river of Croatia's Istria County. It is 23 kilometres (14 mi) long, and its basin covers an area of 279 km2 (108 sq mi). Its mouth is in the long ria of Raški zaljev/Porto d'Arsia, which is a drowned river valley scoured out when world sea levels were lowered, then drowned by the rising waters of the post glacial era. The Raša rises in springs near Pićan and flows south through a steep-sided valley before opening into the head of the Adriatic Sea. The river, although short in length, has an ancient history as a border.
By Roman times, the Arsia, as it was called in Latin, constituted the border between the Histri, who lived west of its banks, and the Liburni on the coast to the east, with the Iapydes in the upcountry valley behind them. After the Romans conquered the fierce and piratical Histri in 177 BC, the Arsia formed the limes of Roman territory in coastal Istria for a generation, until the gap between the Arsia and the northernmost Roman outposts in illyria was closed in 129; for long afterwards it divided Italia Regio X, Venetia et Histria, from Illyricum, according to the divisions ratified by Augustus. The 8th-century Irish monk and geographer Dicuil, following his late Latin sources for the geographical summary De mensura Orbis terrae, gives the northeastern boundary of Italia as flumen Arsia.
The Roman road Via Flavia, reaching from Tergeste (Trieste) into Istria came to an end at the crossing of the Arsia; beyond, it continued into Dalmatia as a local road that linked to Via Gemina.
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