Blue Mountains is a large mountain range dividing the Northern Kingdoms from Haakland and Zerrikania. The mountains form a natural border for at least Lyria, Aedirn and Kaedwen. Dol Blathanna, the Valley of Flowers, lies at the very foot of the mountains, and the river Yaruga's spring is hidden among the rocky heights.
Two coexisting translations of original Polish Góry Sine are a result of lack of proper word in English to denote adjective siny. In Slavic languages it denotes pale or blueish grey of bruises, sickly pale skin or rainy sky. Interestingly, this word can be easily translated to Elder Speech – glas, as in Eredin's moniker, means faded blue, green and grey in many Celtic languages. Speculative Elder Speech for "Faded Greyish Blue Mountains" would be then Glas Arda.