The Bilaren system was an inhabited star system.

In 2369, Amanda Rogers' adoptive parents, marine biologists in Starfleet, were posted to the Bilaren system shortly before their daughter came aboard the USS Enterprise-D. (TNG: "True Q")

This planet was only mentioned in dialogue.
According to Star Trek: Star Charts ("United Federation of Planets I"), there was a Federation member world named Bilaren, which might be a planet in this system.
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