Arvada III

Arvada III is the third planet of the Arvada system and site of a Federation colony.

In the 2330s, Arvada III was the site of a major disaster and the young Beverly Howard and her grandmother, Felisa, were present to help survivors. Traditional medical supplies quickly ran low, and Felisa learned how to use herbs and roots as medication despite the fact she was not a physician. She passed this knowledge down to Beverly, inspiring her to a career in medicine. (TNG: "The Arsenal of Freedom")

The exact details and circumstances surrounding Arvada III were never established. Picard simply recalled it as a "terrible tragedy," so it is unknown what type of disaster afflicted the colony. Arvada III is likely a Class M planet. It also speculated by fans that the Arvada III incident may have been the incident where Beverly's parents were killed.