Northwest passage map

The "Northwest Passage" cutting through Borg Space

Borg space or Borg territory referred to the vast Delta Quadrant space and territory controlled by the Borg. It included thousands of solar systems, all Borg, and millions of Borg vessels. (VOY: "Scorpion")

In 2373, it became clear to the crew of USS Voyager that they were entering the heart of the Borg's territory. There was no way around it, but the ship was able to pass through by leveraging their insight into Species 8472 to forge an alliance with the Borg, lasting just long enough to ensure safe passage. (VOY: "Scorpion", "Scorpion, Part II") Shortly thereafter, another leap of 9500 light year leap truly brought Voyager safely beyond Borg space. (VOY: "The Gift")

However, after crossing Borg space Voyager nonetheless encountered the Borg significantly more often than the few minor encounters before entering it.

During the Borg-Species 8472 War, a narrow corridor within Borg space, nicknamed the Northwest Passage, was effectively cleared of Borg activity due to Species 8472 activity. (VOY: "Scorpion")

Arturis' homeworld was located inside Borg space. (VOY: "Hope and Fear")

It seems likely that the unicomplex was located within Borg space, although this was not explicitly stated. On the other hand, major Borg infrastructure like the Transwarp hub seen in "Endgame" appears to be outside Borg space, or at least the area that was crossed in "Scorpion".
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