A Maquis colony in the Demilitarised Zone whose atmosphere Sisko made uninhabitable to humans in order to force Michael Eddington's surrender in For the Uniform.
Solosos III is a planet settled by Maquis colonists. It appears in the Deep Space Nine episode For the Uniform (2373).
Michael Eddington, the former Starfleet security officer turned Maquis leader, has been releasing cobalt diselenide into the air of Cardassian colonies, a substance deadly to Cardassians but harmless to humans. Sisko, repeatedly outwitted, decides to act the villain Eddington imagines him to be.
He announces that he will do the same to every Maquis world and has the Defiant fire torpedoes loaded with trilithium resin into the atmosphere of Solosos III, rendering it unfit for human life for fifty years. The colonists evacuate. Eddington gives himself up, and the displaced Cardassians and Maquis are left to exchange planets.