According to the pseudo-historic document "Hwandan Gogi" (환단고기/ Hanja: 桓檀古記), Hwan-in transformed himself from the sky of "Sabaek-nyeok"/ "Sabaek-ryeok" (사백력) to become a god, and with him, 800 young men and women descended from the sky to the eastern land of the shallow sea (천해/ Hanja: 淺海), which is the land of "Heuk-su" (흑수/ Hanja: 黑水, "Black Water") and "Baek-san" (백산/ Hanja: 白山, "White Snow-capped Mountain"). Some claims the area of "Sabaek-nyeok"/ "Sabaek-ryeok" is Siberia (in spite of the similarity of prior archaic pronunciation), and the shallow sea is Lake Baikal.