Solais V
From Star Trek : Freedom's Wiki
Solais V is a planet in or near Federation space that was home to two warring Solari factions who, by 2365, were on the brink of mutual extinction.
That year Riva was called in to mediate peace negotiations on the planet when he was attacked and his Chorus was killed at the site of the historic Battle of Zambrano, located on the northern hemisphere of the planet.
Despite the great loss, Riva remained on Solais V to continue the negotiations. (TNG: "Loud As A Whisper")
In late 2371, the Xhosa under Kasidy Yates hauled a shipment of duridium ore to the planet. (DS9: "The Adversary")