The stream is formed at the western slope of Monte Granero in the Cottian Alps and initially runs northwards, before turning east and reaching the comune of Bobbio Pellice.
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Other streams flowing into the Pellice in its later course include the Angrogna and the Chiamogna, near the town of Bricherasio.
"Luserna" more probably refers to Luserna in the Piedmont, rich and populous in Peire’s time, a town on the left bank of the Pellice lying on the road into the Viennois and Dauphiné, Occitan-speaking territories.