Netrunner LCG: The Valley Data Pack - Rules of Play says:
As it boots up the SanSan Cycle , The Valley transports players deep into the heart of SanSan, the number one place for all the top tech. This American megacity sprawls along the California coastline from San Diego in the south to San Francisco in the north. There, you’ll also find Biotech Valley, most often called just “the Valley,” home to the world’s biggest biotech firms and its most advanced genomic research. Home, additionally, to Jinteki Corporation’s flagship American R&D facility, the J-Plex.
This is not a stand-alone deck. An Android: Netrunner The Card Game core set is required to play.