Denobula Triaxa system
The Denobula Triaxa system, or, more simply, Denobula, was an inhabited planetary system in the Beta Quadrant. 

The inhabited planet Denobula, the homeworld of the warp-capable humanoid Denobulans, was located in this system. In 2151, while recording answers to letters from Miss 's fourth grade class, Phlox introduced himself as hailing from this system. ()

In 2259, the location of this system was labeled on a stellar cartography chart that was seen on the 's ready room viewscreen. This system's symbol had a blue color, indicating that it was affiliated with the . () 

In 2399, the location of Denobula was labeled in a a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This system was in or near to space claimed by the Romulan Free State. () 

In 3190, the location of Denobula was labeled on a star chart used by Commander Paul Stamets for tracking the movement of the Dark Matter Anomaly through the galaxy. ()

Appendices

Background information 
As evidenced by an early draft of the series bible for , the point of origin for the ultimately Denobulan Phlox was originally to have been "a system called Noor". 

According to Star Trek: Star Charts (pp. 36 & 44) and  Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Denobula Triaxa (Iota Boötis) system was located in the Alpha Quadrant. This was a trinary star system with one G-class star and two F-class stars. In the 22nd century, the Denobula Triaxa system was a destination on the Denobulan, Earth, and Vulcan trade routes. This system traded with Sol (Earth), Fellebia, Neethia, Pree', Pyrithia, and Vulcan (40 Eridani A). In the late 24th century, this was a Federation system.

According to StarTrek.com, this system contained only one planet.

External links 
 
 

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Star systems