Aidar (river)

The Aidar () is a river of the Luhansk Oblast, Ukraine and Belgorod Oblast, Russia. A left tributary of the Seversky Donets, it flows for ( within Ukraine) and has a basin area of . The slopes of the valley are partitioned with ravines and gorges. In the spring, snow melt accounts for approximately 70% of the flow. The average flow module is 1.7 liters • sec / km ². The river freezes in December.