Klendth

Klendth was an inhabited planet where the Loonkerian outpost was located.

Sometime prior to 2286, a piece of bioengineering technology, known as the universal atmospheric element compensator, was made on the Loonkerian outpost on Klendth.

Spock was asked about this technology in his memory test on following his "rebirth" on  several months earlier. 

Klendth