Herføl Island in Hvaler, Norway From Wikipedia, the free encyclopedia Herføl is a sparsely populated, wooded island in the municipality of Hvaler in Østfold, Norway. The island has an area of 1,9 km2 and is designated with postal code 1690. [1] Map of Herføl Herføl in Ytre Hvaler National Park See also Ytre Hvaler National Park References [1]Geir Thorsnæs. "Herføl". Store norske leksikon. Retrieved December 1, 2016. 59°00′N 11°03′E This Østfold location article is a stub. You can help Wikipedia by adding missing information.vte Related Articles~TimelinesTop QsFact Checks