Járnviðr (The Iron Wood)

32. East sat the crone, in Iârnvidir, and there reared up Fenrir's progeny: of all shall be one especially the moon's devourer, in a troll's semblance.

Völuspá says the crone sat in the east, in Járnviðr, and there reared the offspring of Fenrir, one of whom, in a troll’s shape, will be the devourer of the moon. Gylfaginning says a hag lives in a wood east of Midgard called Járnviðr (the Iron Wood), the home of a race of witches, the Járnviðjur. She is the mother of many gigantic sons shaped like wolves. The most formidable of them, Mánagarmr, will be filled with the life-blood of those near their end, swallow the moon and stain heaven and earth with blood.

Both sources put the wood east of Midgard. The map treats east as the right-hand side; the exact patch of the picture is the artist’s choice.

The name means Iron-wood, and its inhabitants are the járnviðjur, ironwood-women. In Völuspá an old woman in the eastern forest raises Fenrir's offspring, one of whom will snatch the moon. Wikipedia’s article suggests the woman may be Angrboða and the creature Mánagarmr or perhaps Hati, but hedges both.

Snorri changes the picture: the single old woman becomes an old witch bearing many giants in wolf shape, the forest holds plural troll-women, and the moon-swallower is named as Mánagarmr, said to feed on the dead. The plural form appears nowhere else.