Arret (negative)

From Memory Alpha, the free Star Trek reference

You may also be looking for the planet Arret found in our "positive" universe.

Arret was a planet located in the negative universe. It was basically located in the same position as Earth in our "positive" universe.

Karla Five and her son Karl Four lived on this planet during the 23rd century. (TAS: "The Counter-Clock Incident")