Surrounded by mountains in every direction, Tucson Arizona is the largest city in southern Arizona. Approximately 150 companies in Tucson are involved in the design and manufacture of optics and optoelectronics systems, earning the city of Tucson the nickname “Optics Valley”. Downtown Tucson is undergoing a revitalization effort by city planners and the business community, with the primary project in Rio Nuevo- a large retail and community center. Whether you’re visiting for business or pleasure, Tucson has something to offer for everyone.