Bopak III was the uninhabited third planet in the Bopak system within the Gamma Quadrant. This planet was located six weeks away from the closest Dominion outpost and was well-off the established trade routes in the quadrant. The planet housed a jungle and was the homeworld for plants that possessed unusually high concentrations of chlorophyll for a planet orbiting a red giant.
In 2369, a Dominion ship crash landed on Bopak III. The Jem'Hadar Goran'Agar was the only survivor, who was rescued after thirty-five days. Goran'Agar believed that something in the ecosystem of Bopak III had cured him of his addiction to ketracel-white, and three years later, he brought the rest of his unit to the planet to be cured as well. Their ship was detected by a runabout piloted by Miles O'Brien and Julian Bashir, who were captured after landing. Bashir determined that Bopak III was not responsible for curing Goran'Agar. With their supply of white nearly gone, Goran'Agar released the two Starfleet officers and remained on the planet to kill the rest of his unit, rather than letting them die slowly from lack of white. (DS9: "Hippocratic Oath")
Background information Edit
There was disagreement on the pronunciation of this planet's name. "BO-pak" was the pronunciation of the name in the script pronunciation guide for "Hippocratic Oath".  In "Inquisition"'s equivalent guide, however, the pronunciation was "BOH-pahk". 
Despite Bopak III being represented as a jungle planet, it was depicted using a set on a small stage area. Rene Auberjonois, who directed "Hippocratic Oath", found filming the jungle scenes was "difficult" and regretted that a filming location had not been used instead. "We didn't have enough space on the stage and that made it very hard to shoot and I didn't have enough experience to handle that," he conceded. (Star Trek: Deep Space Nine Companion, p. 267)