Tandar Prime was the inhabited prime planet in its star system. This system was located in the Tandar sector. The planet was the homeworld of the Tandarans and the capital of their territory. As of 2152, the legal system was administered by the Central Magistrate's Office.

One of the provinces of Tandar Prime was Querella Province. Prior to 2144, Danik worked as Director of Research at an engineering institute there before being taken into custody for being Suliban. Danik's grandfather was one of the many nomadic Suliban looking for a new home after the Suliban homeworld was destroyed, and he chose to move his family to Tandar Prime.

The capital city of Tandar Prime was quite impressive. When Colonel Grat sent Enterprise to Tandar, he suggested that he would try to pull some strings for an ambassador to give them a private tour. (ENT: "Detained")

This planet was only mentioned in dialogue.
According to Star Trek: Star Charts (p. 60), Tandar Prime was located in the Tandar (39 Tauri) star system. The system's primary was a G-class star. Tandar system was located in the Alpha Quadrant.
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