2 Answers

It's located virtually everywhere. 

Cyberspace is the electronic medium of computer networks, in which online communication takes place.[1]
The term "cyberspace" was first used by the cyberpunk science fiction author William Gibson,[2] though the concept was described somewhat earlier, for example in the Vernor Vinge short story "True Names," and even earlier in John M. Ford's novel, Web of Angels. Widely used since, it has been criticized by its inventor, as Gibson himself would later describe it as an "evocative and essentially meaningless" buzzword that could serve as a cipher for all of his "cybernetic musings".[2] The first component of the term comes from "cybernetics", which is derived from the Greek κυβερν?της (kybern?t?s, steersman, governor, pilot, or rudder), a word introduced by Norbert Wiener for his pioneering work in electronic communication and control science. http://en.wikipedia.org/wiki/Cyberspace

it's a virtual network so it's located all over the world on servers and computers