Alfheim (pronounced "ALF-hame") is one of the Nine Worlds, more specifically the one inhabited by the light elves. According to Hearthstone, it isn't that different from Midgard, only brighter, and with no nights.
The inhabitants of this realm are known as Elves and used to practice magic known as Alf Seidr (which the children of Frey and Frey himself can perform). However, they now have no knowledge of the other realms and sit in front of computers watching 'funny pixie videos' all day long.
The bright light around Alfheim is said to be different from that of Folkvanger. This is because elves need constant sunlight or else they will fade away and die.
Alfheim is described to be like many of the upscale neighborhoods of Boston. Being the world of light and air, Alfheim is constantly bathed in sunlight, with the ground having a spongy texture. There were many mansions with large stone walls, they looked like Tudor-style mansions or postmodern versions of Sleeping Beauty's castle at Disneyland. But there was also a village containing a country club. Hearthstone's mother, Greta, used to go there but she was killed when a delivery truck ran a red light. When Magnus first arrives in Alfheim, he compares it to Wellesley, Massachusetts.
Magnus and Hearth journey to Alfheim to find the Skofnung Stone in order to save Blitz.
Magnus, Blitz, and Hearth journey to Alfheim to find Bolverk's whetstone.
Speaking of Trolls...
When Hearthstone is alerted that Inge is in danger after being captured by another family, he rushes to Alfheim to save her.
|Nine Worlds:||Alfheim | Asgard | Helheim | Jotunheim | Midgard | Muspellheim | Nidavellir | Niflheim | Vanaheim|
|Cities and Towns:||Boston | Flåm | New London | Provincetown | York|
|Administrative Divisions:||Connecticut | Massachusetts | New Hampshire | North Yorkshire | Sogn og Fjordane | South Carolina|
|Countries:||Confederate States of America | Norway | United Kingdom (England) | United States of America|
|Continents:||Europe | North America|
|Other Locations:||Alderman Estate | Bifrost | Blitzen’s Best | Boston Public Library | Bridal Veil Falls | Cape Cod | Charles River | Charleston Harbor | Chase Mansion | Dorchester | Fadlan’s Falafel | Folkvanger | Fort Wagner | Ginnungagap | Hotel Valhalla | Loki’s Cavern | Longfellow Bridge | Lyngvi | Morris Island | Nabbi's Tavern | Provincetown Airport | River Oure | Sessrumnir | Svartalfheim | The Thinking Cup | Yggdrasil|