Tremp is a municipality in Catalonia, Spain, the capital of the comarca of the Pallars Jussà. It is the largest municipality in Catalonia in terms of area, accounting for nearly a quarter of the total area of the comarca.

Pallars Jussà is a comarca (county) in Alt Pirineu, Catalonia, Spain. It was established as a comarca in 1936, out of the old county of Pallars. The name is an archaism meaning "Lower Pallars"; to the northeast and into the mountains is Pallars Sobirà. Its capital and largest municipality is Tremp.