Originally a lake about 3 metres deep, it was transformed into a canal when connected to Saltsjön in the 1920s and a 6 metres deep channel was dug between  and Saltsjön and another to .
Originally a small lake with a depth of about 3 meters, it was transformed into a watercourse by linking it to Saltsjön in the 1920s and then further modified with a 6-meter-deep passage between Saltsjön and another body of water.