Haven in Denmark. See also image.
"...Hadding sat in the great hall near Haven that his grandfather had built."
-War of The Gods, p. 93.
"At his hall near Haven, King Skjold had let build a storehouse for his treasures." (p. 104)
"Folk at Haven...were holding a feast...when Hadding's son Frodi wedded Viborg, daughter of King Hunding in Svithjod." (p. 237)
(This marriage seals an alliance that had ended a feud.)
"The home of Gudorm Thorleifsson lay in northwestern Zealand, a day's ride from Haven." (p. 265)
Hadding's son-in-law, Gudorm, invites Hadding while plotting his assassination. Housecarles from Haven bear and believe the news that Hadding is dead. (p. 285)
"Folk swarmed to the [Yule] offerings in Haven." (p. 288)
There may be more on Haven from Hrolf Kraki.