I was wondering that myself. I was thinking the Himalayas.
The only two Earth locations specifically mentioned in the game are Old Russia and Tibet.
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I think I remember a reference to Tibet. Where would I find that? I don't think it was a Grimoire card
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it was in reference to a device that Future War Cult were constructing. they said someone had found a the remains of a golden age version of the device in Tibet I think it was a ghost fragment Grimoire