peninsula in the E U.S., between Chesapeake Bay on the west & Delaware Bay & the Atlantic on the east, consisting of Del. & parts of Md. & Va.: c. 180 mi (290 km) long
See Delmarva Peninsula in American Heritage Dictionary 4
(dĕl-märˈvə)
A peninsula of the eastern United States separating Chesapeake Bay from Delaware Bay and the Atlantic Ocean. It includes all of Delaware and parts of eastern Maryland and Virginia.