Tri-state area
Informal term describing regions bordering on three US states / From Wikipedia, the free encyclopedia
Tri-state area[1][2] is an informal term in the United States which can refer to any of multiple areas that lie across three states. When referring to populated areas, the term implies a shared economy or culture among the area's residents, typically concentrated around a central metropolis.
Tri-state areas may or may not include a state boundary tripoint.