Folkvangr

Fólkvangr is a meadow in Ásgarðr or Vanaheimr. It is ruled over by Freyja.

It is inhabited by half of those slain in battle (the other half are in Valhǫll) as well as Freya and her daughters Hnoss and Gersemi. It is possible it was once the abode of Óðr as well.

Attestations
In the poem Grímnismál collected in the Poetic Edda, Odin (disguised, or Grímnir) tells the young Agnar that Freyja allots seats to half of those that die in her hall Fólkvangr, while Odin receives the other half (Fólkvangr is here anglicized to Fôlkvang and Folkvang):

In chapter 24 of the Prose Edda book Gylfaginning, High tells Gangleri (described as king Gylfi in disguise) that Freyja is "the most glorious of the ásynjur", that Freyja has a dwelling in the heavens called Fólkvangr, and that "whenever she rides to battle she gets half of the slain, and the other half Odin, as it says here: [the stanza above from Grímnismál is then quoted]". High then continues with a description of Freyja's hall Sessrúmnir.