Erdenekhairkhan (Mongolian: Эрдэнэхайрхан, precious mountain) is a sum of Zavkhan Province in western Mongolia.

The sum centre is 13 km South to Goliin Ekh (Mongolian: Голийн эх River Source), the source of Elsiin River (Mongolian: Элсийн гол Sandy River) running to the Airag Lake.

In 2005, its population was 1,771.

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