Flag of Dornod Aimag in Mongolia, version of 2001.
No officially published blason found, only one published by a third party: http://www.choibalsan.mn/index.php?newsid=689

A white sky in reference to the white banner of the Mongols
The waves of the Kherlen river
The blue steppe of eastern Mongolia
The description above is not very clear about the COA being a part of the flag, but in real life examples it is always present: http://dornod.khural.mn/n/zzao
Own work; New interpretation of blason as defined in Aimag Council decision Nr. 06 of 2001-01-19.
Latebird