DR JUERG ALEAN / SCIENCE PHOTO LIBRARY DR JUERG ALEAN / SCIENCE PHOTO LIBRARY
Avalanche defences (horizontal dark lines) on a mountainside in eastern Switzerland. The barriers are designed to reduce the strength of avalanches. They also protect against other types of debris fall, such as rockslides. The mountain Sukzfluh is seen in the background.
Model release not available. Property release not required.