Nildavellir (Dark Fields) is the home of the dwarves where they live in the dark places in the mountains (under rocks, in caves, and underground). Please note that the place name Nildavellir is used in the Poetic Edda as the home of the dwarves. In the Prose Edda the place name for the home of the dwarves is Svartálfaheim. Unfortunately some “map” makers show two different place when I suspect that different early authors used different names for the same place. I tend to stick with the older name, Nildavellir.
The dwarves are master metal workers and crafts workers and made many of the most memorable and powerful gifts that the gods of Asgard received. Gifts like Thor’s hammer, the magical ring Draupnir and Odin’s spear, Gungnir.
The home of the dwarves is most likely located directly between the southern world of fire and the northern world of ice which existed before the creation of the upper worlds by Odin and his brothers.
Hreiðmarr was the king of Nidavellir and the father of Fafnir, Ótr, Lyngheiðr, Lofnheiðr and Regin. He owned a house of glittering gold and flashing gems built by Regin and guarded by Fafnir. After Otr was accidentally killed by Loki the Æsir repaid Hreiðmarr with Andvari's gold and the cursed the ring Andvaranaut, a magical ring that could make gold. Fafnir and Regin later killed Hreiðmarr for the magical ring. Fafnir decided he wanted Andvaranaut for himself, so he turned into a dragon and drove Regin away. Fafnir guards the treasure until Sigurdarrives and delivers a fatal blow to the dragon.
For most visitors Nildavellir is a cold and desolate place. I suggest that if you go for a visit that you dress warmly. Don’t expect to be warmly greeted by dwarves, they are a warry lot and it may take time to gain their acceptance and even longer their trust. I tend to visit there when I need a new weapon to use in fighting a psychic attack.
I'm Dr. Dave, a modern druid. I lived and worked in Bolivia and Peru for over six years, where I and was trained by Andean Shamans, and today practice Druidcraft and contemporary shamanism.