In Norse mythology, the Svartálfar ("black elves") or Dökkálfar ("Dark elves") are supernatural beings (Old Norse "vættir," wights) that are said to reside in the underground world of Svartálfaheim (possibly Niðavellir). They, like the trolls, are often corollated with the dvergar ("dwarves") and their home is often considered to be the same as Nidavellir, the underground of Midgard, though not as far down as Hel.