 Colloquially, the stretch from Charleroi north to McKeesport (historically because of press coverage of High School sports leagues), is known as the "Mon Valley"; or by some speakers (politicians, reporters and weathermen), the school-league-term has long been extended to mean from the river mouth to northern West Virginia.Once dubbed "Magic City", Charleroi has in recent years seen a gradual revitalization of its business district.Charleroi got its name from the Belgian city of Charleroi.