Which continents are traditionally separated by the Ural Mountains?

The Ural Mountains are traditionally recognized as the major physiographic boundary separating the continents of Europe and Asia.12

While the concept of a continent is often a cultural and historical construct rather than a strictly physical one, geographers generally agree on a boundary line that runs south from the Arctic Ocean along the Ural Mountains. From there, the border continues southwest along the Emba River to the northern shore of the Caspian Sea.2