The Denobula Triaxa system was an inhabited star system. The inhabited planet Denobula, the homeworld of the warp-capable humanoid Denobulans, was located in this system. (ENT: "Breaking the Ice")
As evidenced by an early draft of the series bible for Star Trek: Enterprise, the point of origin for the ultimately Denobulan Phlox was originally to have been "a system called Noor". 
According to the Star Trek: Star Charts (pp. 36 & 44) and the 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 stop on the Denobulan, Earth, and Vulcan trade routes. This system traded with Sol (Earth), Fellebia, Neethia, Pree', Pyrithia, and Vulcan (40 Eridani A).
According to StarTrek.com
, this system contained only one planet.
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