Much of Korriban is a blasted crimson desert with little plant life and infrequent precipitation. Ruins dot the landscape from ages past; the only major modern settle is the Sith Academy. There are small military outposts that dot the planet but the Sith have tightly controlled access to the planet, itself home to many powerful dark side vergences.
Temperatures during the daylight hours are sweltering, at night they tend to plummet to near freezing, and the planet has a nearly thirty hour day as well. During this story it is the season of winter, which brings frequent sandstorms and chilling night time temperatures.