Monastir was a frozen world of the Lyran Star Empire.
The RIS Bouteina went looking for Kzinti spies on the frozen world. Whoville was a key city of the planet. (RIS Bouteina: "Grinch and Scrooge", "Miracle in Whoville")
Granite quarried on Monastir was used in the construction of the Enterprise, as well as other Stoneship-class starships. (Star Trek: The Stoneship Files: "Highly Illogical")
The Magnetize reinforced Monastir with five battalions of marines in order to defend the Monastir Fleet Yards. (Star Trek: The Stoneship Files: "Attack on the Laboratory")
The University of Whoville was an university on the planet. (Star Trek: The Stoneship Files: "Educational Armageddon")