Elgafossen (Elgåfossen) is a 46m unregulated waterfall on the Elja, which marked parts of the international border between Østfold, Norway and Bohuslän, Sweden.

Sarpefossen (Sarp Falls or Sarpsfossen) is a 20m waterfall on the Glomma River powering Sarpsborg City and accelerating Norway’s path to industrialization.