Por el río Martín
- Type: mtb
- Network: rcn
- Operator: Comarca de Andorra Sierra de Arcos
- Reference: BTT 01
- ascent: 610
- cycle_network: Andorra - Sierra de Arcos
- descent: 605
- distance: 36.3
- roundtrip: yes
Mountain bike route from the OpenStreetMap community, with statistics, an elevation profile and gpx and kml downloads.