|Length||155 km (96 mi)|
|Mouth elevation||136 metres (446 ft)|
|Avg. discharge||11 cubic metres per second (390 cu ft/s)—137 cubic metres per second (4,800 cu ft/s)|
|Basin area||3,950 square kilometres (1,530 sq mi)|
The Ileksa (Russian: Илекса) is a river in Onezhsky District of Arkhangelsk Oblast and Pudozhsky District of the Republic of Karelia in Russia. It is the principal tributary of Lake Vodlozero, and thus belongs to the basins of Lake Onega and of the Baltic Sea. It is 155 kilometres (96 mi) long, and the area of its basin 3,950 square kilometres (1,530 sq mi). The main tributary of the Ileksa is the Chusreka River (left).
Ileksa is part of major waterway, which starts as the Verkhnyaya River, which is a tributary of Lake Kalgachinskoye, and continues as the Vodla River (which flows out of Lake Vodlozero) to Lake Onega, further as the Svir River to Lake Ladoga, and further as the Neva River to the Gulf of Finland of the Baltic Sea. The Ileksa connects lakes Kalgachinskoye and Vodlozero. The course of the river passes a number of lakes, the biggest of which are Lake Monastyrskoye, Lake Ik, and Lake Luzskoye, all located in Arkhangelsk Oblast close to the border with Karelia. There are many rapids on the Ileksa.
Almost all of the valley of the Ileksa belongs to the Vodlozersky National Park, shared by Arkhangelsk Oblast and the Republic of Karelia. The park was established in 1991 to protect the taiga, coniferous forests. Since 2001, the National Park has the status of the UNESCO Biosphere Reserve, the first one in Russia.
- Илекса. Great Soviet Encyclopedia.
- Ileksa River in the State Water Register of Russia (Russian)