Border of Europe and Asia, North America and South America.

The conditional division of borders by South and North America flows along the Isthmus of Panama.
The very conditional division of Asia and Europe begins from the north of the Ural Mountains, passes through the entire ridge and along river reservoirs flowing in a southern direction. Further delimitation flows along the coast of the internal Caspian Sea from the western side and passes into the Black Sea water basin. Through the connecting straits of the Black and Mediterranean Seas, the dividing strip stretches into the Atlantic Ocean.