Ciudad Guayana (syōħäħˈ gēănˈə, –änˈ–) [key], formerly Santo Tomé de Guayana, city (1990 pop. 453,047), Bolívar state, Venezuela, at the confluence of the Caroní and Orinoco rivers in the Guiana Highlands. Founded in 1961 and administered by the state economic planning commission, Ciudad Guayana united several smaller cities into one massive residential, industrial, and commercial area with a radius of over 100 mi (160 km). The area includes several hydroelectric stations, aluminum plants, iron- and steelworks, and gold and diamond mines. Forestry products, bricks, and other manufactured goods are also produced. Ciudad Guayana is a port complex, and it is linked to the Guiana region and the rest of the country by a road network; the Orinoco is crossed by a cable-stayed bridge that was completed in 2006. The city has an airport.