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It is named after the Pallars region.
Its source is at Era Font d'era Noguereta in the municipality of Naut Aran (Aran Valley) at an elevation of about 2,000 metres (6,600 ft) and barely 100 metres (330 ft) from those of the Garonne. While the Garonne flows toward the Atlantic Ocean, the Noguera Pallaresa flows to the Segre, and enters that river from the right just before the reservoir of Camarasa (Noguera): its waters then flow to the Mediterranean. The Noguera Pallaresa is dammed at several points, including Talarn Dam, and the largest reservoirs are La Torassa (between Esterri d'Àneu and La Guingueta d'Àneu in the Pallars Sobirà), Sant Antoni (above Talarn in the Pallars Jussà), Terradets (in the municipality of Àger in the Noguera) and Camarasa (just above the confluence with the Segre).