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has 3,588 inhabitants as of January 1, 2002 and covers 88 km².
The whole district is an island group southwest in Østfold. The most important village is Skjærhallen.
| Østfold |
| Aremark | Askim | Eidsberg | Fredrikstad | Halden | Hobøl | Hvaler | Marker | Moss | Rakkestad | Rygge | Rømskog | Råde | Sarpsborg | Skiptvet | Spydeberg | Trøgstad | Våler |
| Municipalities of Norway | Norway |