Lake Arpi (Armenian: Արփի լիճ, romanized: Arp’i lich; Turkish: Arpa Göl[2]) is a lake and reservoir located in the Shirak Province of Armenia, on the Ashotsk plateau in the northwestern part of the country.

In 1946–1950, the Arpi Dam was built on the Akhurian River, artificially increasing the size of the lake.

[5] Prior to the construction of the dam, the lake had a surface area of 4.5 km2, a volume of 5 million m3, and was 1.6 m deep.

[5] During the winter, it is usually completely covered by ice․[3][5] The lake is fed by meltwater[6] and several springs and streams (Karmrajur, Yeghnajur, Elar, etc.).

[6] It hosts the largest colony of Armenian gull in the world;[6] pelicans and different species of ducks and migrating birds can also be seen there.