Regulus III was the inhabited third planet in the Alpha Leonis system, in the Beta Quadrant. (DIS: "Magic to Make the Sanest Man Go Mad") This planet was located three hundred light years from Deep Space 9. (DS9: "Fascination")

In 2371, Jake Sisko's girlfriend, Mardah, was accepted to the Science Academy on this world. Benjamin Sisko was proud of her, stating that it was a good school. (DS9: "Fascination")

This planet was only mentioned in dialogue.
According to Star Trek: Star Charts ("United Federation of Planets I"), in 2378, Regulus III was listed as a Federation member.
Regulus, the primary of the Alpha Leonis system, was located in the Beta Quadrant on a star chart seen in the Star Trek: Discovery episode "Magic to Make the Sanest Man Go Mad".

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