Chalna
Chalna was an inhabited planet. This was the homeworld for the Chalnoth, an anarchistic humanoid species. 

While commanding the  in 2354, Captain Jean-Luc Picard visited Chalna. He recalled his visit there to Esoqq when they were imprisoned together twelve years later. ()

In 2371, the location of Chalna was labeled in the star chart Data and Picard were studying in stellar cartography aboard the . (, okudagram)

Appendices

Apocrypha 
According to the comic book Children of Chaos, the Federation name for Chalna was Kaus Borealis V.

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de:Chalna
Planets
Homeworlds