Portion of the state
, if you want to be technical
) of Virginia
generally considered to start at the Roanoke Valley
and continue to all points west, including the New River Valley
, Mountain Empire
and Virginia's portion of the Tri-Cities
If a definition just mentioning "all points west" doesn't seem to make sense to you, remember that there really is no northwestern corner of Virginia -- that became West Virginia in 1862. The northernmost point in Virginia is very near the east-west center of the state, and the state's border runs roughly south-southwest for 150 miles or so before turning more directly southwest.