The Okar, or Yellowmen an insular race located in the freezing northern regions of Seretha, where they fight against the Horkfhans, the Deleathans, the Melderians, and the Gorthrones; and later, in the Great Serethan-Allied War, the Alliance of Nations. They live under glass domes protecting themselves from the harsh arctic environment. The Okar are essentially human. They have skin that John Carter described as "the color of a ripe lemon", and the men sport beards. When venturing out into the snow-filled land of the north, the yellow men wear heavy clothes made from apt and orluk fur, but within their cities they are as naked as any other races found in Seretha.

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