The Delmarva Peninsula, or simply Delmarva, is a large peninsula on the East Coast of the United States, occupied by the vast majority of the state of Delaware and parts of the Eastern Shore of Maryland and Eastern Shore of Virginia.

The East Coast of the United States, also known as the Eastern Seaboard, the Atlantic Coast, and the Atlantic Seaboard, is the region encompassing the coastline where the Eastern United States meets the Atlantic Ocean. The Thirteen Colonies, which formed the United States in 1776 were located on this coast, and it has played an important role in the development of the United States.