Aoos (Albanian: Vjosë) is a river of Epirus with a total length of 260 km. Of these, 70 km are in Greek territory and the remaining 190 km in Albanian territory. The Aoos rises from the northern Pindos and initially flows through a gorge between the Tymfi and Smolika mountains. Northwest of Konitsa it enters Albania and flows into the Adriatic Sea. An artificial lake has been built at the source of the Aoos, which is located at an altitude of 1 340 m, for water supply and electricity supply in the surrounding area. Due to the beauty of the landscape around the lake, the area of the springs (Viko-Aoos National Park) is developing rapidly in terms of tourism. A little further north of the Aoos springs is the Pindos National Park. The Aoos River flows through a large part of the Viko-Aoos National Park. In this section it forms a gorge between the northern slopes of Tymfi and the southern branches of Smolika. The total length of the gorge is 8 km and its width ranges from 300 m to 2,5 km. The vegetation in this section is particularly rich. The Stomio Monastery is built inside the gorge, while at its exit is the large single-arch bridge of Konitsa, built in 1870.