The Merkys is a river in southern Lithuania and northern Belarus. It flows for 13 km through Belarus, 5 km along the Belarusian–Lithuanian border, and 195 km through Lithuania before joining the Nemun
The Ūla is a river which starts in northern Belarus and flows into the Merkys river, in southern Lithuania.
Merkys
…below it only 0.7 m3/s (25 cu ft/s). At the end of the 19th century the drainage basin of the Merkys grew by some 410 km2 (160 sq mi) as its tributary Ūla overtook some of the Kotra's watershed area. The Merkys is a popular destination among water tourism enthusiasts as part of it belongs to the Dzūkija…