Chuluunkhoroot (Mongolian: Чулуунхороот, stone corral), also Ereentsav (Эрээнцав), is a sum (district) center in the Dornod Province, Mongolia.

[1] It is located very close to the Russian-Mongolian border, and sees frequent visits from Solov'yovsk on the Russian side.

[2] It was established in the 1950s as a state farm collective, drawing settlers from other areas in the region, with tractors and large equipment mainly purchased from Russia.

Due to this relatively large-scale settling, the town is an ethnic mix of Halh (60-65%), Buryat (about 30% from villages like Dashbalbar, Gurvanzagal, and Tsagaan Ovoo), and others (approx.

Following the collapse of the Soviet Union, much of the Russian population left, taking their equipment with them, resulting in a rapid decline of the town's economic foundation.