Volag-Noc

Volag-Noc was a cold, snowy planet in the Mutter's Spiral and was used as a prison world by Humans.

At some point, the Doctor was sent to Volag-Noc by the Shadow Proclamation, along with a Sontaran, Ogron and Draconian. They were shot down before they reached Volag-Noc. (IDW: Fugitive)

In the 42nd century, Volag-Noc was run by robot Wardens and the android Governor Lok. Baltazar had been sent there three times. Here he had first learned of the Infinite, and found the chip carriers were fellow prisoners Gurney and Captain Kaliko, and the messenger Ulysees Meregrass. Kaliko and Baltazar escaped Volag-Noc, while Gurney took over the prison and locked up Governor Lok. When the Doctor came to Volag-Noc, he freed the Governor, who tried to kill all the prisoners, forcing the Doctor to shut him down. When the Doctor was trapped on the planet, he spent 3 years repairing the prison. (DW: The Infinite Quest)

In the 251st century, Volag-Noc was still in use. Dirk Slipstream was sent there by the Doctor for murdering 600 people, though he escaped after 6 years. (NSA: Night of the Humans)

Behind the scenes
Volag-Noc is similar to the Klingon prison planet of Rura Penthe from the Star Trek franchise as both are extremely cold prison worlds.