Aiviekste

River in Latvia

The Aiviekste is a river in Latvia. It begins at Lake Lubāns and drains into the Daugava. The Aiviekste is the largest tributary of the Daugava in Latvia. The Aiviekste, along with the Pededze, forms the unofficial border between two historical Latvian regions Vidzeme and Latgale, although the administrative border was slightly different. The river is 114 kilometers long, with annual drainage 1.81 km3. The Aiviekste is between 10,000 and 12,000 years old, formed at the end of the last ice age. Nearly a quarter of the river's flow is unregulated, but most of the river has been excavated, including with explosions.

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