Completed in 3940, the Enaj Arcology is the largest and most populous human arcology known. As of 4000, the arcology had 100 million living within it. It is part of the city of Enaj on Sivad. The arcology's design is somewhat novel in that instead of being simply one structure, it is made of several smaller arcology systems in a modular format. Not only does this allow the arcology to grow over time, it also means that a shutdown in one place is much less likely to impact other areas of the Enaj Arcology.