A Federation colony world left on the Cardassian side of the Demilitarised Zone, where Sisko's friend Calvin Hudson was posted and the Maquis first took shape.
Volan III is one of the colonies affected by the Federation's treaty with Cardassia, which redrew the border and placed some human settlements under Cardassian jurisdiction. It appears in The Maquis, Part I (2370).
Lieutenant Commander Calvin Hudson, an old friend of Sisko, serves there as Starfleet's attache to the colonies of the Demilitarised Zone. After the Cardassian freighter Bok'Nor is blown up at Deep Space Nine, Sisko and Gul Dukat travel to the colonies, and a tense meeting between settlers and Cardassian officers shows how close the zone is to open fighting.
Hudson turns out to be a leader of the Maquis, colonists who have taken up arms. The Cardassian agent impersonating Raymond Boone in Tribunal is also said to have settled on Volan III.