Tau Ceti Prime was a prime planet orbiting the star Tau Ceti.

Vice Admiral Janeway died on Tau Ceti Prime, when he drowned under an ice cap, in 2358. (VOY: "Coda")

According to the Star Trek: Star Charts (p. 44) and the Stellar Cartography: The Starfleet Reference Library ("Alpha Quadrant: Local Space Extract"), Tau Ceti Prime was located in the Alpha Quadrant.
According to the Star Trek Encyclopedia (3rd ed., p. 499), Tau Ceti Prime was the first planet in the Tau Ceti system.

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