Planet (The Daleks' Master Plan)

An unnamed "planet of ice" was where became stranded after the First Doctor stole his directional unit during an encounter with the Daleks, who coerced the Monk into retrieving the taranium core to complete their Time Destructor.

The planet had a sea and several icebergs, (TV: The Daleks' Master Plan) with nothing but blocks of ice and snow-laden rocks on the barren tundra. Wind whipped across the icy wastelands, driving huge clouds of snow across the surface of the world. (PROSE: The Mutation of Time)

The Monk's TARDIS changed into a block of ice upon arrival, the Monk confused as he had set course for elsewhere. Realising the Doctor had stolen his directional unit, the Monk lamented that he would have to wander in time and space as lost as the Doctor was; (TV: The Daleks' Master Plan)

Tt took him time to repair his TARDIS and construct new circuits, but having escaped the ice planet, the Monk lowered the temperature of his TARDIS to remember what being in the cold felt like so as to keep his desire for revenge fueled, as he spent decades planning. He eventually trapped the Seventh Doctor on the planet, intending to leave him for the rest of his lives. The Doctor was able to escape, however, using a piece of the Monk's TARDIS disguised as Danny Pain's autograph. (PROSE: No Future)

The Monk never did learn the name of the planet. (AUDIO: The Book of Kells) However, he remembered being stranded on it as one of the worst things the Doctor did to him. (AUDIO: The Secret History)