Transwarp network

The Borg transwarp network across the galaxy

The Borg transwarp network was a vast array of transwarp conduits that spanned the galaxy. The network was controlled by a series of six transwarp hubs located in various points of Borg space. The transwarp network was supported by a series of interspatial manifolds, whose shielding was regulated from the central nexus by the Borg Queen herself.

The transwarp network was disabled in 2378 by the crew of USS Voyager. Having introduced a neurolytic pathogen into the Collective, Voyager used the chaos to infiltrate the network and destroy the interspatial manifolds of at least one hub with transphasic torpedoes. (VOY: "Endgame")

Curiously, although Janeway mentions Seven telling her "there were only six of them in the galaxy", the graphic only shows four transwarp hubs, one in each quadrant.