Aklion VII was the inhabited seventh planet in its star system.
In 2401, Aklion VII had recently experienced a series of anti-Kolinahr demonstrations. Since no Vulcan would have willingly visited the planet as a result and consider the act blasphemy, Commander Seven of Nine suggested it as a meeting place to Captain Tuvok, telling him it was where she underwent a procedure to stabilize her neural pattern. Tuvok's uninformed response exposed him as having been replaced by a Changeling. (PIC: "Dominion")
This planet was only mentioned in dialogue.