Explanation
The modern geographical boundary between Europe and Asia is defined by the Ural Mountains, the Ural River, a portion of the Caspian Sea, and the Caucasus Mountains, making "All of these" the correct answer.
Practice this MCQ: According to modern geographers which point(s) draw boundary between Europe and Asia?. Check correct answer and detailed explanation...
The modern geographical boundary between Europe and Asia is defined by the Ural Mountains, the Ural River, a portion of the Caspian Sea, and the Caucasus Mountains, making "All of these" the correct answer.