Fourth stage
- Trail Conditions: On foot
- Interest: Flora, Religion, Hystory
- Departure: Decontra (815m)
- Arrival: Fonte Tettone (1,655m)
- Difficulty Level: EE - For expert hikers
- Length: 14.5 km
- Difference in height: Uphill 1,050m - Downhill 450m
- Recommended Period: from May to November
From Decontra you go up briefly along the P path until you turn off for the B1 which climbs up through maple groves first and wide meadows then up to Pianagrande.
The stage touches the following sections of the Park paths:
- P From Decontra to the beginning of B1
- B1 From Decontra to Pianagrande
- S and B1 From Piangrande to Fonte Centiata intersection (passing through the hermitage of S. Giovanni)
- B1 From the Fonte Centiata intersection to the intersection with P
- P From intersection with B1 to F. te Tettone