Dorin was a planet located in the galaxy's Expansion Region that was the homeworld of the Kel Dor species. Its Dorin gas and helium-rich environment meant that they were forced to rely on rebreathers, such as antiox breath masks, to survive off-world, as oxygen was deadly to them. During the Clone Wars, Jedi General Anakin Skywalker and Commander Ahsoka Tano routed Separatist forces near Dorin.
While the atmosphere was not breathable for most off-world species, the native plants were edible. Zand nuts and the fruit of kand trees were two such foods.