Kri'stak volcano
The Kri'stak volcano was a mountain on Qo'noS, near the Lake of Lusor. 

According to legend, Kahless the Unforgettable forged the first bat'leth (the Sword of Kahless) after thrusting a lock of his hair into a river of lava from the volcano's summit, then plunging the burning hair into the Lake of Lusor, and, finally, as it cooled, twisting the hair into a sword. ()

External link

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Qo'noS
Geography