are niflheim and helheim the same?
Niflheim (“house of mists”) is the far northern region of icy fogs and mists, darkness and cold. It is situated on the lowest level of the universe. The realm of death, Helheim is part of the vast, cold region. Niflheim lies underneath the third root of Yggdrasil, close to the spring Hvergelmir (“roaring cauldron”).