Beth Delta I was the inhabited first planet in its star system.

Paul Stubbs wanted to take Deanna Troi to this planet, to show her the settlement of New Manhattan "as you've never seen it" while drinking some champagne. (TNG: "Evolution")

This planet was only mentioned in dialogue.
According to Star Trek: Star Charts, on the chart "United Federation of Planets I", in 2378, Beth Delta I was listed as a Federation member.

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