Kastoria (regional unit) in the context of "Western Macedonia"

Devoll District(Rrethi i Devollit) was one of the thirty-six districts of Albania (which were dissolved in 2000) that is now part of Korçë County. It derives its name from the Devoll river flowing through the valley. It had a population of 33,785, and an area of 429 km². It is in the southeastern corner of the country, and its capital is Bilisht. Its busy border point Kapshticë/Krystallopigi connects the district with the Greek regional units of Florina and Kastoria to the east and southeast. Devoll borders the district of Kolonjë to the southwest and Korçë to the west and north. Devoll is also considered a traditional or "ethnographic" region with borders similar to the former district.

Orestis (Greek: Ὀρεστίς) was a region of Upper Macedonia, corresponding roughly to the modern Kastoria regional unit located in West Macedonia, Greece. Its inhabitants were the Orestae, an ancient Greek tribe that was part of the Molossian tribal state or koinon.

The Haliacmon (Greek: Αλιάκμονας, Aliákmonas; formerly: Ἁλιάκμων, Aliákmon or Haliákmōn) is the longest river of Greece, flowing entirely on Greek soil in the region of Macedonia, with a total length of 297 km (185 mi). In Greece there are three rivers longer than Haliacmon: Evros (Greek: Έβρος), Strymonas (Greek: Στρυμόνας), both coming from Bulgaria, and Axios (Greek: Αξιός) coming from North Macedonia, but the length of each one of them in Greek territory is less than that of Haliacmon, which flows entirely in Greece. Haliacmon is the traditional English name for the river, but many sources cite the formerly official Katharevousa version of the name, Aliákmon. Today, the only official variant is the demotic Aliákmonas. It flows through the Greek regions of Western Macedonia (Kastoria, Grevena and Kozani regional units) and Central Macedonia (Imathia and Pieria regional units). Its drainage basin is 8,813 km (3,403 sq mi).

Devoll (Albanian: [ˈdɛˈvɔɫ]; Albanian definite form: Devolli) is a municipality in Korçë County, southeastern Albania. The municipality consists of the administrative units of Hoçisht, Miras, Progër and Qendër Bilisht with Bilisht constituting its seat. As of the Institute of Statistics estimate from the 2011 census, there were 26.716 in Devoll Municipality. It derives its name from the Devoll River flowing through the valley. The border point Kapshticë/Krystallopigi connects Devoll with the Greek regional units of Florina and Kastoria to the east and southeast. Devoll borders the municipalities of Kolonjë to the southwest, Korçë to the west, Maliq to the northwest and Pustec to the north. The area of the municipality is 453.27 km (175.01 sq mi).

The Sarantaporos (Greek: Σαραντάπορος, Albanian: Sarandapor) is a river in northwestern Greece and southern Albania. It is a right tributary of the river Vjosa, which flows into the Adriatic Sea. Its length is 50 km (31 mi), of which the final approx. 10 km (6.2 mi) form the border between Greece and Albania. Its source is between the mountain ranges Gramos and Voio, in the Kastoria regional unit. The Sarantaporos flows through the municipal units Arrenes, Mastorochoria and Konitsa in Greece, and the municipalities Qendër Leskovik and Çarshovë in Albania. Its basin area is 870 km (340 sq mi), and its year-average discharge is 6.93 m (245 cu ft) per second.

Voio (Greek: Βόιο, Vóio; Ancient Greek: Βόιον - Boeon) is a mountain range in the southwestern Kastoria and western Kozani regional units in Macedonia, Greece. The mountain is part of the Pindus mountains. Its highest elevation is 1,805 m. It is a densely forested and sparsely populated mountain range. It is drained towards the river Sarantaporos in the west and towards the Aliakmonas in the east. The nearest mountain ranges are Gramos to the west and Smolikas to the southwest.

The nearest villages are Pentalofos in the east, Eptachori in the west and Kypseli in the north. The municipality Voio, named after the mountains, is situated in the eastern part. The Greek National Road 20 (Kozani - Konitsa - Ioannina) passes through the mountains, 2 km south of the highest point. The first home of the Boeotians was the mountain Boion; the mountain gave them their name.

National Road 20 (Greek: Εθνική Οδός 20, abbreviated as EO20) is a single carriageway road in northwestern Greece. It links the cities of Ioannina and Kozani via Konitsa and Siatista. It passes through the Ioannina, Kastoria and the Kozani regional units. Since the opening of the A2 motorway (Egnatia Odos), it is no longer the fastest connection between Kozani and Ioannina. The section between Ioannina and Kalpaki is part of the European route E853.