It is a Solid or a Frame structure.
Man made-1. Changes of the enviormentBever made-2. unwanted still water-population in misquetoes
It's at the border between Brazil and Paraguay.
The Key Consultant Engineer for the project was Piero Sembenalli Find more facts about itaipu dam at: http://www.aboutcivil.com/megastructures-itaipu-dam.html
The itaipu dam was important because people had to discover the nature of land.