In the disciplines dealing with the human body, it is extremely important to precisely specify the planes, axes and directions.
An important archaeological site located on the right bank of the Danube in eastern Serbia, within the Iron Gates gorge.
Bulgaria's natural resources include a great variety of minerals.
This scene presents the climate zones and soil types of Bulgaria.
Riverbed engineering refers to artificial modification of the course or flow of rivers.
The animation shows the city of Szeged before it was devastated by the great flood.