Briona Gwydion the Dragonbein Range (竜骨山脈ブリューナ・ギデオン) is a Lost Ground located at Θ Hidden Forbidden Dragonbein. In Project .hack, "Dragonbein Range" was translated as Keel Mountains, but the reason for the change is unknown.

(The World R:2 History: Briona Gwydion the Dragonbein Range is made up of the bones of Gwydion, the true dragon who pulled the chariot of Taranis, the sun god.)

(Epitaph of the Twilight: In the Epitaph, the Keel Mountains are home to an ape that can speak the language of humans. It asks those who pass by the strange riddle:"What clings to you? Bear it you cannot, accept it you cannot, but hidden it is from you. Recite its name." The answer being one's own name; the name of their shadow. On the other side of the mountains lives a wise dragon named Sheraton.)


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