Zona Río (English: "River Zone") is an official zone, and the main modern business district, of the city of Tijuana, Mexico.
Zona Río is located at a strategic point, in the north of the city, about 1 mile (1.6 km) from the U.S.-Mexico border and 9 miles (14 km) from downtown San Diego. The Río Zone is within the Delegación Centro, or Central borough, of Tijuana. The old downtown of Tijuana, Zona Centro, borders Zona Río on the west.
An edge city is a concentration of business, shopping, and entertainment outside a traditional downtown or central business district, in what had previously been a suburban, residential or rural area. The term was popularized by the 1991 book Edge City: Life on the New Frontier by Joel Garreau, who established its current meaning while working as a reporter for The Washington Post. Garreau argues that the edge city has become the standard form of urban growth worldwide, representing a 20th-century urban form unlike that of the 19th-century central downtown. Other terms for these areas include suburban activity centers, megacenters, and suburban business districts. These districts have now developed in many countries.