[region] Raška (Рашка) or Old Raška (Стара Рашка) is a region in south-central Serbia and northern Montenegro. In Serbia, the Raška District, Zlatibor District and Moravica District. In the Middle Ages, the region was a center of the Serbian Principality and of the Serbian Kingdom whose capital was once the city of Ras (a ...
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http://en.wikipedia.org/wiki/Raška_(region)
[river] The Raška (Рашка) is a river in southwestern Serbia, a 60 km-long left tributary to the Ibar river. Its historical name is Arzon (Greek: Αρζον). The Raška originates from a strong well and several sinking streams flowing out from the cave south of the Sopoćani monastery, in the Pešter region. Waters of the well and the...
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http://en.wikipedia.org/wiki/Raška_(river)

(from the article `Nemanji Dynasty`) ruling Serbian family that from the late 12th to the mid-14th century developed the principality of Raka into a large empire....incorporated Thessaly, Epirus, Macedonia, all of modern Albania and Montenegro, a substantial part of Bosnia, and Serbia as far north as the ... Although Serb historia...
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http://www.britannica.com/eb/a-z/r/13
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