Comodoro Rivadavia, often shortened to Comodoro, is a city in the Patagonian province of Chubut in southern Argentina, located on the San Jorge Gulf, an inlet of the Atlantic Ocean, at the foot of the Chenque Hill. Comodoro Rivadavia is the most important city of the San Jorge Basin, and is the largest city in Chubut as well as the largest city south of the southern 45th parallel.

Chubut is a province in southern Argentina, situated between the 42nd parallel south, the 46th parallel south, the Andes range to the west, and the Atlantic Ocean to the east. The province's name derives from the Tehuelche word chupat, meaning "transparent". their description of the Chubut River.