Canaileus Prime was a Federation colony on the edge of the Typhon Expanse and home to nearly 48,000 Federation civilians and Starfleet officers by 2372.

In 2298, the Federation and Myhr'an disputed each other's right to the planet, and the Battle of Canaileus Prime ensued. The Federation won, starting a 70-odd year period of non-contact between the two powers. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part One")

Starfleet completed terraforming of Canaileus Prime in 2370. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part One")

Starfleet ordered all available starships to rendezvous at Canaileus Prime to regroup to face the Myhr'an threat as it was believed this planet was the next target of the Myhr'an planet killer. This sparked the Second Battle of Canaileus Prime. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part Two")

Milami Thall was stationed as one of the engineers on Canaileus Prime in 2372. (Star Trek: The Cantabrian Expeditions: "Oh, What a Lovely War")

Canaileus is pronounced "cah-NAIL-ee-us".
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