
thumb|right|260px|Drainage basin of Bolgarchay The Bolgarchay (, ) is a river, which forms part of the Azerbaijan–Iran border. It is long, and has a drainage basin of .
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thumb|right|260px|Drainage basin of Bolgarchay The Bolgarchay (, ) is a river, which forms part of the Azerbaijan–Iran border. It is long, and has a drainage basin of .
==Description== The Bolgarchay rises from slopes of Qaracadağ, Talysh Mountains at the border of Iran and Azerbaijan. It is joined by its tributaries, all flowing from the Iranian side of its drainage basin. It flows along the Iranian-Azerbaijani border, and enters Azerbaijan at Bileh Savar. The Bolgarchay pours into Mahmudchala Lake. River's flow comes from precipitation and groundwater. In summer, river's flow decreases and sometimes dries up.
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