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The Tri-Cities, or Tri-City area, is a vernacular region that is situated between the large cities of Aurora and Elgin, Illinois, and encompasses the cities of Batavia, Geneva, and St. Charles. A "vernacular region" is a distinctive area where the inhabitants collectively consider themselves interconnected by a shared history, mutual interests, and a common identity. Such regions are "intellectual inventions" and a form of shorthand to identify things, people, and places. Vernacular regions reflect a "sense of place," but rarely coincide with established jurisdictional borders.