eastern United States, East - the region of the United States lying north of the Ohio River and east of the Mississippi River

Appalachian Mountains, Appalachians - a mountain range in the eastern United States extending from Quebec to the Gulf of Mexico; a historic barrier to early westward expansion of the United States

chain of mountains, mountain chain, mountain range, range of mountains, range, chain - a series of hills or mountains; "the valley was between two ranges of hills"; "the plains lay just beyond the mountain range"