Tomarii was a planet located in the trinary Tomariian star system that was dominated by the red giant star IIlan. Located outside the boundaries of 23rd century Federation space, Tomarii was the homeworld of the Tomariian civilization.
The planet Tomarii was cold and inhospitable, and few plants were able to thrive there, leaving all animal lifeforms on the world to subsist as meat-eaters. The planet was tidally-locked with the giant star IIlan, meaning that one side always faced the star, and was quite uninhabitable. Because of the close orbit of the second star in the system, the only way to approach the world was to ride a series of magnetic currents that formed a corridor between the two stars. (TOS novel: Black Fire)