The Lan'Tuana sector was a region of space near the Federation, inhabited by sentient quadrupeds.

In an illusion created by the telepathic pitcher plant in 2375, Starfleet appointed Neelix ambassador to the Lan'Tuana sector. (VOY: "Bliss")

This sector was only mentioned in dialogue.
The Star Trek Encyclopedia (4th ed., vol. 1, p. 452), where the sector's name was spelled "Lan'tuan Sector", located this region in the Alpha Quadrant.
Community content is available under CC-BY-NC unless otherwise noted.