The mountain worlds of the Caucasus mark a magical border between Europe and Asia. This film is an impressive documentary about the natural wonders between the Black and Caspian Seas. The wild mountain landscape with its extreme climate has formed a unique animal and plant world. It makes the Caucasus one of the world's 25 most important centres of biological diversity. Mountain bison, Caucasian kingfowl and Caucasian tur are found only here. The film shows the species and landscape diversity of the Lesser Caucasus in Armenia, Georgia and Azerbaijan. Shielded from the main ridge of the Great Caucasus, a heat-loving animal and plant world has been able to develop there. From the mountains of Dagestan down into the canyons of the Caspian Depression to the biblical Mount Ararat.