Dorin, the Kel Dor species' homeworld, existed within the Expansion Region of the galaxy as a planet. The Dorin gas and helium-saturated atmosphere of this world necessitated that the Kel Dor employ rebreathers, like antiox breath masks, for survival beyond their planet, because oxygen proved lethal to them. In the course of the Clone Wars, Separatist forces were routed in the vicinity of Dorin by Jedi General Anakin Skywalker and Commander Ahsoka Tano.
Despite the unbreathability of its atmosphere for most non-native beings, Dorin's indigenous flora provided sustenance. Examples include zand nuts and the fruit borne by kand trees.