Best natural monuments around Prossedi are found within the Lepini Mountains, offering a diverse natural landscape. This region features karstic caves, mountain summits, and unique water bodies. Prossedi serves as a base for exploring these geological formations and natural attractions. The area provides opportunities for outdoor activities amidst its varied terrain.
Last updated: June 28, 2026
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Monument with a panoramic view from which you can enjoy a beautiful tranquility.
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Challenging climb, some sections even over 8%. Be careful on the hairpin bends, you may come across cars
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The Ouso di Passo Pratiglio is a cave that opens at an altitude of 1,360 meters on the south-east side of Mount Malaina. Discovered in 1976, it was explored in 1996 to a depth of -299 meters. Today it is the deepest cave in Lazio, with a depth of about 840 meters. ⚠️ Be very careful when approaching!
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The lakes are in the municipality of Pontinia even if on the border with Priverno to see them at their best, go up to the farmhouse (fraction of Priverno) with an off-road route to admire them at their best
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Monte Gemma is part of the Lepini Mountains, with a height of 1457m. Following the path n.23 you will reach an iron cross.
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steep but the view over the Pontine plain deserves
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The Gricilli lakes are part of an uncontaminated natural area where surfurea water flows. In the summer months, a dip to cool off is highly recommended
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The Ouso di Passo Pratiglio is a cave discovered in the late 1970s. Over time, groups of speleologists have managed to explore the cavity going down to -840 m. The entrance to the cave is not delimited, therefore you must be very careful when approaching.
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Near Prossedi, you can explore a variety of natural monuments. The Monte Gemma Summit offers panoramic views from its 1457m height in the Lepini Mountains. For a unique water feature, visit the Lakes of Gricilli, known for their striking sky-blue, sulphurous waters. The region is also home to fascinating caves like the Grotta degli Ausi, a karstic resurgence cave with beautiful limestone formations and an underground waterfall.
Yes, the Grotta degli Ausi is considered an easy excursion due to its horizontal layout, making it accessible to a wider range of visitors. While a headlamp is recommended, it generally doesn't require specialized speleological equipment. Inside, you can marvel at intricate limestone formations and an underground waterfall.
The natural monuments around Prossedi are primarily characterized by karstic formations. The Grotta degli Ausi, for instance, showcases stunning stalactites and stalagmites, along with deep pools of crystal-clear water. The Lakes of Gricilli are another geological marvel, featuring sulphurous water that gives them their distinctive sky-blue color.
Yes, the Lakes of Gricilli are ideal for relaxing and cooling off, especially during warmer days, thanks to their sulphurous waters. Additionally, after exploring the Grotta degli Ausi, visitors have the option to swim in the nearby Amaseno river.
The Grotta degli Ausi offers an accessible and fascinating experience for families, with its easy horizontal exploration and diverse cave-dwelling wildlife. The Lakes of Gricilli are also a great spot for families to relax and cool off. For a blend of history and nature, the Monument to the Ciociara Mother provides a family-friendly viewpoint with panoramic scenery.
The area around Prossedi offers a range of outdoor activities. You can find numerous options for hiking, including moderate trails like the Sonnino - Monte Romano Trail or more challenging routes. For cyclists, there are MTB trails and road cycling routes, such as the challenging Macallè Climb which offers great views.
The Ouso di Passo Pratiglio Cave, while a significant natural monument and the deepest in Lazio, is primarily a site for experienced speleologists. Its depth of about 840 meters and vertical progression require specialized equipment and extreme caution, making it unsuitable for casual tourism.
The Grotta degli Ausi is home to diverse wildlife adapted to its underground environment. Beyond numerous bat colonies that use the left branch as a summer refuge, you can also find the Dolicopota insect, which thrives in underground life, as well as fish like the Chub and crayfish in its waters.
The Grotta degli Ausi maintains constant, pleasant temperatures year-round, allowing for exploration at any time. For other outdoor activities like hiking to the Monte Gemma Summit or visiting the Lakes of Gricilli, spring and autumn generally offer the most comfortable weather conditions. Summer can be pleasant, especially for cooling off in the waters, but some cave branches might have reduced water flow.
Yes, for those seeking a challenge, the Macallè Climb is a demanding route with sections exceeding an 8% gradient, rewarding climbers with expansive views over the Pontine plain. Additionally, the Monte Gemma Summit, part of the Lepini Mountains, offers an intermediate hiking experience to its 1457m peak.
Visitors appreciate the diverse natural landscape, from the striking sky-blue waters of the Lakes of Gricilli where they can cool off, to the panoramic views from the Monte Gemma Summit. The accessibility and unique geological features of the Grotta degli Ausi also draw significant interest, offering a fascinating underground experience.


Extend your search for the best caves by checking out these guides of the top ones around Prossedi: