Takeuchi-monjo (an ancient text which recorded the lineage of ancient kami and a dynasty preceding Emperor Jinmu) wrote Hida Province as "日玉国" or "日霊国," indicating that Hida was Takamanohara (plain of high heaven) and Kuraiyama Mountain was the Pyramid.
竹内文書では飛騨国は"日玉国""日霊国"で記され、飛騨が高天原であり、位山がピラミッドと考えている。