Final answer:
The Rio Grande, Sabine, and Red River are examples of physical features that create political borders.
Step-by-step explanation:
The Rio Grande, Sabine, and Red River are examples of physical features that create political borders. Natural physical geographic features often serve as political boundaries, such as rivers, mountain ranges, and large lakes. These features determine the border between different countries or regions. For example, the Rio Grande forms a portion of the border between the United States and Mexico.