遼聖宗統和二十二年（1004年）設立防州[1]，治所在今蒙古國塔勒—烏蘭·巴勒嘎斯（Талын-Улан балгас）古城（或稱塔林烏蘭赫日穆Талын-Улаан хэрэм[2]）。米文平根據蒙古國學者考古成果，以土拉河和鄂爾渾河之間的青陶蓋古城東南的塔勒—烏蘭·巴勒嘎斯古城為防州，不轄縣。為蕭撻凜上表請求修建的三州之一（鎮州、維州、防州）遼國滅亡後，成為克烈部游牧區。
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