Flag of Bayan-Ölgiy Aymag, Mongolia
Formal description (date of decision not found):
http://www.bayan-olgii.gov.mn/pages/introduction

Blue sides for the eternal sky
Green center for the earth to live on
A yellow crescent moon, in honor of the mostly muslim inhabitants of the aimag
Size proportions of 2/1
Own work; Faithful implementation of blason.
User:Latebird