My... My base!
Eggman's base is the general name for the name of Dr. Eggman's place of residence. Due in part to Eggman's villainous lifestyle, as well as his many enemies and rivals, Eggman's bases are frequently destroyed. As such, he has many bases around Earth, some more specialized than others. His main base is located in the Green Hill Zone, west of Green Hill Town.
Eggman's base is small but technologically advanced. It is assumed that this is where he conducts his scientific experiments and builds robots.