The Kobliad were a humanoid species native to the Alpha Quadrant.
By the 24th century, the entire species was dying from deteriorating cells. One remedy for their condition was deuridium. Rao Vantika attempted to steal a shipment of deuridium from the Gamma Quadrant in 2369 but was hunted down by Kobliad Security officer Ty Kajada. (DS9: "The Passenger")
A Kobliad was a patron in a bar on Ronara Prime in 2370 where he shared an intimate moment with Lieutenant Ro Laren. (TNG: "Preemptive Strike")
A Kobliad woman was seen on the Promenade in 2370. (DS9: "Rules of Acquisition")
Yteppa, who assisted the Obsidian Order in kidnapping Major Kira Nerys in 2371 was a member of the Kobliad species. (DS9: "Second Skin")
According to the Star Trek: Star Charts, on page 47, the Kobliad were from the Kobliad star system. This system was a binary star system. Both the primary and the secondary stars were both F-type stars. This system was located in the Alpha Quadrant.
In the Star Trek: Titan novels, a Kobliad, Fo Hachesa, serves aboard the USS Titan.