Multiple realities
(covers information from several alternate timelines)
Tonnata VII was the seventh planet in the Tonnata system. This system was located in the Beta Quadrant. (DIS: "Vaulting Ambition"; PIC: "Maps and Legends")
In the mirror universe, this was the homeworld for the Comtaxan parasite. (DIS: "Vaulting Ambition")
This planet was only mentioned in dialogue.
Tonnata was located in the Beta Quadrant on a star chart seen in the Star Trek: Picard episode "Maps and Legends".
According to the revised edition of the Stellar Cartography: The Starfleet Reference Library ("History of the United Federation of Planets"), the Tonnata system was located in the Beta Quadrant.