Cranes that breed in southern Sweden overwinter usually in Extremadura, in southwestern Spain. The cranes fly every year from Spain to Sweden in March. After a cold autumn night, maybe in the beginning of October, the cranes leave Hornborgasjön. Breakup is magnificent. Groups of birds takes height and head south, to a pleasant winter in Spain.
Hornborgasjön is one of the 51 wetlands in Sweden we have particular responsibility under the Wetlands Convention. The lake is just over 10 kilometers long and two to three kilometers wide. The area is about 35 square kilometers. Maximum water depth is 1.5 meters (at mean water level). Water level can, in extreme cases, vary by almost two meters during the year. The lake harbors some 50 breeding wetland dependent species. A total of 290 species have been seen in the area.