There are seven lakes at Rõuge primeval valley, which is 10 km long and 52 metres deep. The lakes are: Kahrila, Tõugjärv, Ratasjärv, Kaussjärv, Rõuge Suurjärv, Liinjärv, and Valgjärv. The lakes are connected by the River Rõuge or River Ajo, which starts from the valley Tindiorg.
Tindiorg, Külmorg, Mõhkorg, Ööbikuorg, Tinopeetri, Hinni, Sikasoo, and Järveotsa are the tributary valleys of Rõuge primeval valley. Ööbikuorg (Nightingale Valley), which borders the ancient hillfort from the North, is the most well-known. The valley is 300 m long and 12–15 m deep. It got its name from the singing nightingales who stay there during the springs, when bird cherries bloom.
The Rõuge Nightingale Valley Centre is located at the edge of Ööbikuorg, and it provides information about nature, history, and climate changes.