| Giole | |
| Name Other: | Greek, Modern (1453-);: Γκιόλε |
| Map: | Balkans 4087 cut kostursko.png |
| Source1 Location: | Lake Kastoria east of Dupjak |
| Source1 Coordinates: | 40.487°N 21.3091°W |
| Mouth Location: | Aliakmonas River south of Nea Kotaratsa |
| Mouth Coordinates: | 40.4193°N 21.3371°W |
| Subdivision Type1: | Countries |
| Subdivision Name1: | Greece |
| Subdivision Type2: | Region |
| Subdivision Name2: | Kastoria, Aegean Macedonia |
| Length: | 10 km |
Giole (also known as Ezerska Reka[1] or Kourti;[2] el|Γκιόλε, Gióli, Góli) is a river in the Kastoria region of Aegean Macedonia.[3] It is 10 km long.
The river is the only outflow from Lake Kastoria. Its name originates from the Turkish term göl meaning “lake.”[3] It flows from the southern end of the lake, 1.85 km east of Dupjak and west of Krpeni, flowing southwards in meanders. It passes under the main road from Kastoria to Klisoura, flowing by Zdravltsi, Slimnishta, and Nea Kotaratsa before it joins the Aliakmonas as a left tributary.
Revolutionary Georgi Hristov wrote about the river:
At the outflow of the Giole from the lake, a dam was built by French engineers in 1916.[4] In 1932, a concrete spillway with movable gates was constructed to control the lake's water level.[4] [5] Later, the gates were replaced with electric ones,[4] located 550 m from the lake's shoreline to channel water into the river.[3] Experimental regulation of the gates in 2016 improved the lake's water quality from poor in 2014 to moderate in 2016.[6]