Transwarp Hub
From FEInfobase
A Transwarp Hub was a large powerful structure the Borg had constructed. Before 2377 there was at least six of these structures in the Milky Way galaxy. The Transwarp Hubs regulated the Borg's powerful tactical advantage of deploying ships anywhere in the galaxy using Transwarp abilities. Each hub was connected via numerous transwarp conduits acting like a huge network. This network was destroyed by the USS Voyager in 2377.
A transwarp hub was found constructed in the Bassen Rift during the Borg War and was destroyed by the Federation Alliance.