Hersæter is a village in Indre Østfold Municipality, in Østfold, Norway. Hersæter lies at 171 m above sea level. The nearest city is Ski, 34 km to the west. Among the landmarks around are Basmo Fortress (7.6 km), Søndre Høland Church (7.7 km) and Trøgstad Church (6.1 km). Among the natural features are Brattåsen (4.0 km) and Trøgstad varde (4.5 km).
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