The Trboje Lake was created between Kranj and Mavčiče as a result of damming the river Sava when they built the hydroelectric power plant Mavčiče. The water partially flooded the spectacular canyon Zarica that Sava cut into the gravel detritus agglutinate in a conglomerate on Kranjsko polje andSorško polje. Gravel pits, river groves and rapids were replaced by a lake that became the home of many water birds. Some build their nests here, some come on winter migration and others are only visiting. Especially worth mentioning is “veliki žagar” or Mergus merganser as most of the Slovene population of this rare bird nests at the Trboje lake. Vegetation that is otherwise found in the mountains grows here on variegated conglomerate rocks. Among them is also edelweiss which at the Trboje Lake grows at the lowest elevation in Slovenia.