Ciudad Bolívar, formerly known as Angostura and St. Thomas de Guyana, is the capital of Venezuela's southeastern Bolívar State. It lies at the spot where the Orinoco River narrows to about 1 mile (1.6 km) in width, is the site of the first bridge across the river, and is a major riverport for the eastern regions of Venezuela.

Bolívar is one of the 23 states of Venezuela. The state capital city is Ciudad Bolívar and the largest city is Ciudad Guayana. Bolívar State covers a total surface area of 242,801 km2 (93,746 sq mi) and as of the 2011 census, had a population of 1,410,964. The state contains Angel Falls.