LakeNorway · NO
Tvetervann
Tvetervann is a compact forest lake in the Skjeberg woodlands of Sarpsborg, Østfold, beloved by locals for its scenic 7-kilometre shoreline walk. The lake sits at 79 metres elevation, stretches 1.8 kilometres, and covers 1.14 square kilometres—a modest body of water with an outsized reputation as a day-trip destination in southeastern Norway. What gives Tvetervann its distinctive character is a remarkable layer of industrial heritage hidden in the woods: a set of early-1900s dams and a charming old pump house that once sent drinking water through a 20-kilometre pipeline to the city of Fredrikstad. Today, with those restrictions lifted in summer 2025, the lake opens up as a place for swimming, fishing, walking, and trail biking in a landscape where human engineering and Norwegian forest meet.