Bolgarchai
Bolgarchai
(known as Bolgaru in its upper reaches), a river in Azerbaijan SSR. It is 134 km long, drains a basin of 2,170 sq km, and rises on the northern slopes of the Talysh Mountains. The Bolgarchai seasonally dries up in its lower reaches. It is used for irrigation. Downstream it is supplemented by water from the Azizbekov Canal. In its upper and middle reaches, the Bolgarchai forms part of the USSR-Iran border.