Final answer:
Tennessee is the state that includes both the Smoky Mountains and the Cumberland Plateau, which are part of the Appalachian Mountains.
Step-by-step explanation:
The state that features both the Smoky Mountains and the Cumberland Plateau, which are parts of the Appalachian Mountains, is Tennessee.
These mountainous regions are a testament to the complex geological history of Eastern North America. The Smoky Mountains, also known as the Great Smoky Mountains, are a subrange of the Appalachian Mountains and are primarily located along the Tennessee-North Carolina border.
The Cumberland Plateau extends into Tennessee and is considered the westernmost part of the Appalachian Plateau, also reflecting the area's geological diversity.
Both of these features are characterized by their rich biodiversity and significant geological formations, contributing to the allure of the state's natural landscapes.