The Void (region)

The Void is a region of space, perhaps 9 light-years across, which is shielded off from the rest of the galaxy by a barrier of subspace. The void is (seemingly) entirely empty.

Matter gets sucked into the void periodically by vortexes which open and close sporadically. Many spacecraft have been engulfed in such a way, and come to live in the void, having no way to escape.

All the inhabitants of the Void have become accustomed to preying on each other-- and on new arrivals to the Void-- to survive.

The USS Voyager was sucked into the void, and, before it could make its escape, Captain Janeway began an alliance with other inhabitants of the void; together, the alliance was able to escape. (Voy Episode: "The Void")