The word "Helheim" is barely medieval. Old Norse sources overwhelmingly say Hel for the realm of the dead, using the same word for the place and for the being who holds it, and Helheimr appears rarely — most familiarly in Sörla þáttr, a late text. The compound became standard later, largely because modern languages need to distinguish the queen from her country in a way Old Norse did not.
That ambiguity is not a technicality. It shapes everything about how the Norse dead were described.
The road
The clearest picture comes from Hermóðr's ride in Gylfaginning, which is the only sustained account of the journey.
He rides nine nights through valleys so dark and deep that he sees nothing until he reaches the river Gjöll and the bridge over it, which is thatched with shining gold. A maiden called Móðguðr keeps it, and she remarks that the bridge rang more under him alone than under five companies of dead men who rode over it the day before — and that he does not have the colour of a dead man, so why is he riding the road to Hel?
He rides on, downward and northward, until he comes to Helgrind, the gate, which Sleipnir clears in a single leap without touching it. Inside, Baldr is sitting in the high seat.
Every element of that is a border crossing: a river, a toll-bridge with a keeper, a challenge about identity, and a gate. The Norse underworld is administered.
What it is like inside
Cold and dim, and not much else. The sources give it none of the torment that "hell" imports.
Snorri's household of grimly-named furniture — the hall Éljúðnir, the dish Hunger, the knife Famine — belongs to Hel herself, and may well be his own composition. The older poems are much barer. Baldrs draumar has Odin ride east to the high hall and find the benches strewn and the mead brewed under a shield, waiting for Baldr — a picture of a hall expecting an honoured guest, not a prison.
That is the crucial point about the place: it is not a punishment. Most people go there. Baldr, the best of the gods, goes there because he was killed by a thrown weapon rather than in battle. Brynhildr rides there in a wagon. There is no sorting by virtue at the gate, and no torment described for the ordinary dead.
The exception is Náströnd, the corpse-shore in Völuspá, where oath-breakers, murderers and adulterers wade venom-streams in a hall woven of serpents. That stanza is a real part of the text and it is also the part most often suspected of Christian influence — see Níðhöggr, who eats there. It sits apart from everything else the corpus says about the dead.
Hel-shoes and other practicalities
The prose sources record a burial custom directly tied to the journey. Gísla saga describes hel-skór, hel-shoes, bound onto a dead man's feet so he can walk to Hel — the character binding them remarks that if they will not stay on, he does not know how to fasten shoes.
That is not cosmology; it is what somebody did at a graveside. Together with grave-goods, food deposits, and the boat and horse burials of the Viking age, it indicates a widespread expectation that the dead were going somewhere and would need equipment.
Whether the somewhere was Hel, the burial mound, Rán's hall or Valhalla is exactly the question the sources refuse to settle. Several incompatible destinations coexist, and the sagas' walking dead suggest a fourth expectation entirely — that the dead stay in the mound and can be dealt with there.
Christianisation of the word
Missionary translators took hel for the Christian place of torment because it was the available vernacular word for the abode of the dead, which is exactly what happened with Greek Hades and Hebrew Sheol in earlier translations. The Gothic halja, Old English hell and Old High German hella were all pressed into that service.
The consequence is that the English word arrives loaded with fire, devils and judgement, none of which is in the Norse material — and that later Norse writers, working after conversion, began describing their own underworld in terms borrowed back from the Christian one. Sorting the two layers apart in a text like Völuspá is one of the standing problems in the field.
For the mist-world it lies beneath, see Niflheim; for its keeper, Hel; for the hound at the road, Garmr; and for how it compares with other traditions' arrangements, the underworlds compared.
Where is it — down, north, or east?
All three appear. Snorri's Hermóðr rides down and north; Baldrs draumar has Odin ride down and east; and Snorri also places the realm under a root of Yggdrasil in Niflheimr. The directions are not coordinates but qualities: north is cold, down is beneath the living, east is where giants and monsters live in Norse mental geography. Trying to reconcile them into a single map is a modern impulse. The consistent element across all versions is the descent, the river and the gate.
Do the dead in Hel do anything?
Almost nothing is recorded, which is itself striking next to the detailed daily routine given for Valhalla. Baldr sits in a high seat and receives a visitor. The dead ride over a bridge in companies. A dead seeress can be woken and made to speak, unwillingly. At Ragnarök a ship carries a crew from the realm to the last battle, which is the one moment the ordinary dead act collectively. Beyond that the corpus is silent — and given that this was the destination most people expected, that silence is the single largest gap in Norse religious literature.