Khanbulanchay reservoir (Azerbaijani: Xanbulançay su anbarı), also known as Khanbulaqchay reservoir, is a lake in Lankaran Rayon of southeastern Azerbaijan. The name means "the spring of the khan" in Azerbaijani language.
The reservoir was built Bəşəriçay river in 1976. The overall area is 2.46 km2 (0.95 sq mi).The volume of water in the reservoir is 52 million m³. The altitude of the dam built on the reservoir is 64 m (210 ft), the length is 550 m (1,800 ft). The reservoir is used for irrigation purposes in 22 ha (0.22 km2) of land in subtropical zone through the 7.8 km (4.8 mi) and 8.2 km (5.1 mi) long channels.