Nature Reserve Guide
Riserva Naturale Basso Merse, a nature reserve in the hilly terrain of central Siena and Grosseto provinces, Italy, encompasses 1,640 hectares dedicated to conserving the natural habitats of the lower Merse River, Stata stream, and Crevole torrent. The landscape features a mix of old oak forests, Mediterranean scrub, and unique serpentinite rock formations, with hills generally not exceeding 400 meters above sea level. This diverse environment provides a setting for several sports like hiking, road cycling, mountain biking, jogging, and…
114
Routes
4.3
(324)
Average rating
2676
People visited

4.4
(43)
141
hikers
9.73km
02:46
220m
220m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

5.0
(3)
7
hikers
10.2km
02:50
190m
180m
Moderate hike. Good fitness required. Mostly accessible paths. Sure-footedness required.

4.5
(24)
104
hikers
13.7km
03:54
310m
310m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

4.8
(17)
57
hikers
13.2km
03:46
310m
310m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
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4.5
(2)
60
riders
70.8km
03:49
1,430m
1,430m
Hard road ride. Very good fitness required. Some segments of this route may be unpaved and difficult to ride.

5.0
(5)
92
riders
45.8km
02:21
530m
530m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.

5.0
(5)
76
riders
53.0km
02:58
880m
880m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.

3.0
(1)
39
riders
50.7km
02:24
680m
680m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
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5.0
(1)
1
riders
28.2km
02:37
730m
730m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

5.0
(3)
46
riders
130km
10:44
2,230m
2,230m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.

19
riders
28.5km
02:00
350m
350m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

4.7
(3)
18
riders
29.1km
02:05
390m
390m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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17.4km
02:06
480m
480m
Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

1
runners
12.1km
01:22
320m
320m
Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

17.7km
02:12
590m
590m
Hard run. Very good fitness required. Mostly accessible paths. Some sure footedness required.

2.0
(1)
7
runners
8.06km
01:01
280m
280m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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4.8
(37)
428
riders
86.8km
06:05
1,440m
1,440m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

5.0
(9)
237
riders
128km
09:08
2,210m
2,200m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

5.0
(5)
125
riders
136km
09:37
2,170m
2,170m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

4.9
(8)
144
riders
104km
07:09
1,680m
1,680m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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69
riders
130km
10:13
2,340m
2,340m
Hard bike ride. Very good fitness required. You may need to push your bike for some segments of this route.

5.0
(5)
35
riders
37.1km
02:36
690m
690m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

4.7
(6)
26
riders
27.5km
02:06
710m
710m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

4.0
(1)
16
riders
59.3km
04:08
1,010m
1,010m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Riserva Naturale Basso Merse offers a variety of outdoor activities, including hiking, road cycling, mountain biking, jogging, touring cycling, and gravel biking. The reserve features more than 80 routes across these sports, catering to different interests and fitness levels. Over 1,000 visitors have shared their experiences, with routes averaging a 4.3-star rating on komoot.
Popular hiking trails include the Mills of Val di Merse Trail, a 6.0-mile (9.7 km) route, and The Farma stream and the baths of Petriolo, which is 6.3 miles (10.2 km). Another option is the Farma Stream – Petriolo Thermal Baths loop from Bagni di Petriolo, spanning 8.9 miles (14.3 km).
Yes, the reserve offers paths suitable for all skill levels, including easily accessible sections. While some terrain can be rocky, many trails are less challenging. For more options, refer to the Easy hikes in Riserva Naturale Basso Merse guide on komoot.
Road cyclists can explore routes like the San Fabiano Countryside View – Grancia di Cuna loop from Murlo, a 28.4-mile (45.7 km) moderate route. More challenging options include the Natural Reserve of Val Merse — Ring tour, covering 43.9 miles (70.7 km). Additional routes are detailed in the Road Cycling Routes in Riserva Naturale Basso Merse guide.
The reserve features diverse terrain, including riverine environments along the Merse, Farma, and Ombrone rivers. Landscapes include old oak forests, Mediterranean scrub, and hills generally under 1,300 feet (400 meters) above sea level. Unique serpentinite rock formations are also present, supporting specialized plant species.
Yes, the reserve is home to several points of interest. Natural features include the unique serpentinite rock formations and diverse river habitats. Historical sites include the Hermitage of Montespecchio, also known as "Conventaccio," and remnants of the old Murlo Mines Railway. The Terme di Petriolo, with its 108°F (42°C) thermal waters, is also located within the reserve.
The reserve's diverse habitats support various wildlife. European otters, common kingfishers, European green toads, and spectacled salamanders inhabit the river systems. Birds of prey such as short-toed eagles, black kites, common buzzards, and kestrels can be seen in clearings. Roe deer and wild boars are also present, particularly after dusk.
Komoot offers several guides for the area, including Hiking in Riserva Naturale Basso Merse, Road Cycling Routes in Riserva Naturale Basso Merse, and MTB Trails in Riserva Naturale Basso Merse. There are also guides for Running Trails, Gravel biking, and Waterfall hikes.
Yes, mountain biking is a popular activity in the reserve. Trails include the Farmavia Loop Trail, a 17.5-mile (28.2 km) moderate route. Another option is the Murlo – Murlo loop from Murlo, which is 17.7 miles (28.5 km). More information is available in the MTB Trails in Riserva Naturale Basso Merse guide.
Information about the Riserva Naturale Basso Merse can be found on the Terre di Siena tourism portal. For specific inquiries related to the Terme di Petriolo, which is located within the reserve, a contact number is +39 0577 757104.
Gravel biking routes are available, such as the Radi Village – Strade Bianche Radi loop from Casciano, a challenging 32.3-mile (52.0 km) route. Another option is the Murlo – Murlo loop from Murlo, a moderate 15.4-mile (24.7 km) trail. The Gravel biking in Riserva Naturale Basso Merse guide provides further details.

