It used to be a peaceful fishing village before Shinra built the new city right beside it. The city's elevated airfield was built directly above the old village, blocking out the sun and polluting the surrounding seas. As a result the once-thriving fishing industry has died out but the economically deprived village soldiers on, dominated by its larger neighbor.
The new city of Junon became the secondary headquarters for the Shinra Corporation and the central office for the Vice President, Rufus Shinra. Junon is heavily defended by retractable artillery batteries and its sizable Shinra garrison as well as being the initial home of Shinra's major defense project, the Sister Ray, a large long-range cannon powered by Huge Materia. As well as being Shinra's primary airbase, Junon is also a major port, having a Submarine dock below in the Junon Underwater Reactor and being one of the ports of call for the Cargo Ship.