|Source||near Penruddock and Motherby|
|Mouth||Confluence with River Eden|
The source of the Petteril is near Penruddock and Motherby, from where the young river runs southeast through Greystoke, Blencow and Newton Reigny, before passing under the M6 motorway, after which the river turns north, and the motorway roughly follows the course of the river towards Carlisle.
Having reached Carlisle, the Petteril runs a course through the south east of Carlisle, dividing the suburbs of Harraby, Upperby and Botcherby, and running alongside the West Coast Main Line for a significant distance, before joining the River Eden on its journey to the Solway Firth. Along its course, the major tributaries of the Petteril include the River North Petteril, Stony Beck, Calthwaite Beck, Blackrack Beck, and Woodside Beck.
- "River Petteril | Co-Curate". co-curate.ncl.ac.uk. Retrieved 17 March 2019.
- "Rail line between Carlisle and Newcastle closed after derailment". The Guardian. 20 October 2022. Retrieved 20 October 2022.
- Photographs and article, RAIL issue 969, 2 November 2022