Political Boundaries: Political boundaries are the man-made lines that define the limits of countries or states. They can be influenced by natural borders but are ultimately determined by human decisions.
Physical Geography: Physical geography studies the characteristics and processes of Earth's physical features, including natural borders like rivers. It examines how these features shape landscapes and impact human activities.
International Disputes: International disputes arise when countries have conflicting interpretations or claims over certain territories, including those defined by natural borders. These conflicts often require diplomatic negotiations to resolve.