Final answer:
The eastern part of the region differs from the western part in terms of geography. The western part has a coastal plain, river basins, and foothills, while the eastern part has mountain ranges and a narrow coastal plain.
Step-by-step explanation:
The eastern part of the region is different from the western part in terms of geography. The western part has an extensive coastal plain, river basins, and small foothills, while the eastern part has high mountain ranges and a narrow coastal plain. Additionally, the southwestern region of the western part consists of mountains and valleys.