The Kurlan system was a planetary system. A planet in this system, Kurl, was the homeworld for the Kurlans, an extinct species. This system was located quite some distance from Federation space.

The only planet capable of supporting life near the Kurlan system was Loren III. (TNG: "The Chase")

This system was only mentioned in dialogue.
When Loren III is first mentioned, Picard quite clearly says that it is in the Kurlan system, despite the script using the word near instead. However, once the ship arrives at the planet it is specifically described as the third planet in the Loren system.
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