Denobula
Denobula was an inhabited planet in the Denobula Triaxa system, located in the Alpha Quadrant. It was the homeworld of the Denobulans, a warp-capable humanoid species.

Environment
Denobula contained a single, relatively small continent. ()

Flora and fauna
 Denobulan blood worm
 Denobulan lemur
 Tartan vole

Locations 
 Kaybin District

History 
Genetic engineering was used on Denobula since the mid-20th century, according to Phlox to "generally positive effect." However, genetic engineering was only used to repair genetic deficiencies: they never tried to "redesign" their species in an attempt to "improve" it, unlike what humanity did during the disastrous Eugenics Wars. ()

The first Human to serve on Denobula was Doctor Jeremy Lucas, who was stationed there circa September 2151. ()

As of 2152, Denobula was heavily populated, with twelve billion inhabitants. The cities were quite crowded, albeit by choice as Denobulans naturally enjoyed large social gatherings and preferred not to move to off-world colonies. Phlox noted that the atmosphere was "vibrant, communal". The riverside nightclubs of the Kaybin District were known as meeting places to find intimate partners during the Denobulan mating season. ()

Denobula was mentioned in a hallucination Hoshi Sato experienced in mid-2152. She imagined asking Phlox if people on Denobula spoke about the dreamt-up figure Cyrus Ramsey, which Phlox then denied. ()

In reality, later the same year, Phlox requested information on Pa'nar Syndrome from Vulcan doctor Yuris, claiming it was on behalf of a colleague on Denobula studying thymic sclerosis. ()

In 2153, a group of Denobulan scientists studied a system of caves on the planet , seeking to avert seismic disasters on Denobula. ()

In 2155, a representative from Denobula participated in talks at Starfleet Headquarters on Earth to form a Coalition of Planets. ()

Appendices

References 
 (referred to as homeworld)

Background information 

This planet's quadrant of origin is inferred based on the position of its star system as seen in the star chart appearing in the  episode .

Depicting the planet in canon 
As evidenced by an early draft of the series bible for , the point of origin for Phlox was originally to have been "a system called Noor". 

Phlox actor John Billingsley imagined the Denobulan homeworld as a utopia, to the point of causing the Denobulans to become insular. "I mean, maybe it's so Eden-like [on Denobula]," he reckoned, "that it's like, 'Oh, what do I want to go out there for? I've got everything that I want right here." ()

Denobula was mentioned in voiceover dialogue that was scripted for  but not included in the final version of that episode; at one point, Phlox said that miners who had been assigned, along with him, to a Denobulan mining facility on Pree'nos had tried to make their compound as much like Denobula as they could (such as with "entertainment from home"), though that hadn't seemed right to him. The planet was likewise referred to once in the final draft script of  but not in the final edit of that installment.

Denobula was referenced once in a deleted scene from , Phlox mentioning that he was looking forward to introducing nearly thirty new-found descendants of his (who were meanwhile aboard a version of Enterprise from an alternate timeline) to his wives on Denobula. (ENT Season 3 DVD & Blu-ray special features)

Denobula was also referenced in the final draft script of , though not in the final version of that episode. In the script, a scene description stated, "Fond memories of Denobula give Phlox something to smile about, even in these dire surroundings."

Shortly before  was cancelled at the end of its fourth season, John Billingsley expressed an interest in viewing Denobula in the series, saying, "I would love to see a visit to Denobula."  In fact, Manny Coto once stated that, if the series had gone into a fifth season, Enterprise would indeed have visited the planet.

Details from reference works 
The  – in the article for the Denobulans – placed Denobula in the Alpha Quadrant.

According to StarTrek.com, Denobula was a class M planet and the sole planet in its system. 

According to the reference book Star Trek: Federation - The First 150 Years (p. 75), a Romulan force attacked Denobula and its orbiting spaceport in 2158. The ambush resulted in over three million casualties and intimidated Denobula, causing it to refrain from supporting the Coalition of Planets during the Earth-Romulan War.

According to Star Trek: Star Charts (p. 44; "United Federation of Planets I"), in 2378, Denobula was a Federation member. This planet was located in the Alpha Quadrant.

According to Stellar Cartography: The Starfleet Reference Library ("Stellar Cartography" p. 13; "Federation Historical Highlights, 2161-2385"), the Denobula Triaxa system was located in the Alpha Quadrant.

Apocrypha
The Star Trek: Vanguard  Precipice mentions the national reserve bank in Denobula's capital city being broken into, in the mid-23rd century.

According to the reference book Star Trek: Federation - The First 150 Years, Denobula was attacked by a Romulan fleet during the Earth-Romulan War, causing the deaths of 3 million Denobulans.

Denobula appears in the computer game Star Trek Timelines.

External links 
 
 

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Planets
Homeworlds