Eastern Region is the correct answer. The Eastern Region of North America is characterized by the Appalachian Mountains and the Atlantic coastal plain. This region encompasses several states in the eastern part of the United States, including Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Maryland, Delaware, Virginia, West Virginia, North Carolina, South Carolina, Georgia, and Florida.

The Appalachian Mountains:
- The Appalachian Mountains are a major mountain range that stretches from eastern Canada down to Alabama in the United States.
- They are one of the oldest mountain ranges in the world and are known for their scenic beauty and diverse ecosystems.
- The mountains are characterized by rolling hills, deep valleys, and forested slopes. They provide habitat for a variety of plant and animal species.

The Atlantic Coastal Plain:
- The Atlantic coastal plain is a low-lying flat area that runs parallel to the Atlantic Ocean.
- It stretches from Cape Cod in Massachusetts down to the southern tip of Florida and continues along the Gulf of Mexico coast.
- The plain is characterized by sandy beaches, marshes, swamps, and barrier islands.
- It is an important region for agriculture, with fertile soils that support the production of crops such as corn, soybeans, and tobacco.

Cultural and Historical Significance:
- The Eastern Region has a rich cultural and historical heritage. It was the site of the first European settlements in North America, including Jamestown and Plymouth.
- The region played a significant role in the American Revolution and the Civil War.
- It is also known for its vibrant cities, such as New York City, Boston, Philadelphia, and Atlanta, which are centers of commerce, culture, and innovation.

Conclusion:
The Eastern Region of North America, characterized by the Appalachian Mountains and the Atlantic coastal plain, is a diverse and culturally significant area. Its natural beauty, historical significance, and economic importance make it a unique and important region in North America.