Trømborg is a settlement in Indre Østfold Municipality, in Østfold, Norway. It has 256 inhabitants (2025). The nearest city is Ski, 38 km to the west. Near the border: Sweden, 21 km. Among the landmarks around are Skiptvet Church (11.2 km), Eidsberg Church (5.9 km) and Basmo Fortress (15.9 km). Among the natural features are Sarp Falls (29 km) and Hekollen (7.1 km).
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