Helva

"Why would Morgana attack Helva? That's one of the few places where magic is practiced freely."

- Merlin to Arthur

Helva is a city in Odin's Kingdom. It is one of the few places in Albion where magic is practiced freely.

History
When Morgana attacked Helva during her hunt for Alator, the handful of survivors fled over Camelot's border to seek sanctuary at its western garrison (The Kindness of Strangers).