Best natural monuments around Posta Fibreno are concentrated within a protected natural area, offering diverse geological and ecological features. The region is characterized by a karstic lake fed by underground sources, supporting a unique ecosystem. This area provides opportunities to explore natural phenomena, observe wildlife, and engage in outdoor activities. The landscape includes mountains, forests, and water bodies, making it a destination for nature enthusiasts.
Last updated: August 21, 2026
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A few kilometers from the town of Alvito, among the mountains bordering Abruzzo, there is the so-called Fossa Maiura (815 m), a karst depression that almost forms a natural amphitheater: it is a gigantic sinkhole about 100 meters deep and about 3 km in circumference, in the shape of an inverted truncated cone with a perimeter of more than a kilometer. This is where the waters that feed the Fibreno originate.
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The sense of wonder that this work gives thanks to its colors that, immersed in the woods, create a truly special sensation.
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guide to the work: https://www.arteparco.com/opere/2018-2/ ARTEPARCO is a project born with the desire to bring contemporary art into the National Park of Abruzzo, Lazio and Molise, one of the most ancient naturalistic sites in Italy, a symbol of uncontaminated nature. Every year an artist is invited to confront the Old-Grown Forests, recognized in 2017 as a UNESCO heritage site. Arteparco is a union between Art and Nature, which combines artistic beauty with unique and uncontaminated places such as the Park, an open-air museum where nature alone is the protagonist. The initiative is born from the collaboration between the Park Authority, the Municipality of Pescasseroli and PARCO1923 – a perfume brand inspired by the plants and flowers of the Park – and is carried out with the support of BMW Italia, which has always shown particular attention to the issues of sustainability and environmental protection, and Sky Arte, the in-depth television channel dedicated to culture and art. Partners of the project for the first time also GORE-TEX, a leading company in the creation of technologies for outdoor clothing, committed to ensuring a positive economic and social impact while respecting the environment, and the Woolrich Out Door Foundation, which is committed to protecting and safeguarding outdoor spaces for communities around the world. For the commitment to the enhancement of the territory demonstrated over the years by ARTEPARCO, the initiative enjoys the Patronage of the Ministry of Ecological Transition.
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guide to the work: https://www.arteparco.com/opere/2023-2/ ARTEPARCO is a project born with the desire to bring contemporary art into the National Park of Abruzzo, Lazio and Molise, one of the most ancient naturalistic sites in Italy, a symbol of uncontaminated nature. Every year an artist is invited to confront the Old-Grown Forests, recognized in 2017 as a UNESCO heritage site. Arteparco is a union between Art and Nature, which combines artistic beauty with unique and uncontaminated places such as the Park, an open-air museum where nature alone is the protagonist. The initiative is born from the collaboration between the Park Authority, the Municipality of Pescasseroli and PARCO1923 – a perfume brand inspired by the plants and flowers of the Park – and is carried out with the support of BMW Italia, which has always shown particular attention to the issues of sustainability and environmental protection, and Sky Arte, the in-depth television channel dedicated to culture and art. Partners of the project for the first time also GORE-TEX, a leading company in the creation of technologies for outdoor clothing, committed to ensuring a positive economic and social impact while respecting the environment, and the Woolrich Out Door Foundation, which is committed to protecting and safeguarding outdoor spaces for communities around the world. For the commitment to the enhancement of the territory demonstrated over the years by ARTEPARCO, the initiative enjoys the Patronage of the Ministry of Ecological Transition.
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audio guide of the work: https://www.arteparco.com/opere/2023-2/ ARTEPARCO is a project born with the desire to bring contemporary art into the National Park of Abruzzo, Lazio and Molise, one of the most ancient naturalistic sites in Italy, a symbol of uncontaminated nature. Every year an artist is invited to confront the Old-Grown Forests, recognized in 2017 as a UNESCO heritage site. Arteparco is a union between Art and Nature, which combines artistic beauty with unique and uncontaminated places such as the Park, an open-air museum where nature alone is the protagonist. The initiative is born from the collaboration between the Park Authority, the Municipality of Pescasseroli and PARCO1923 - a perfume brand inspired by the plants and flowers of the Park - and is carried out with the support of BMW Italia, which has always shown particular attention to the issues of sustainability and environmental protection, and Sky Arte, the in-depth television channel dedicated to culture and art. Partners of the project for the first time also include GORE-TEX, a leading company in the creation of technologies for outdoor clothing, committed to ensuring a positive economic and social impact while respecting the environment, and the Woolrich Out Door Foundation, which is committed to protecting and safeguarding outdoor spaces for communities around the world. For the commitment to the enhancement of the territory demonstrated over the years by ARTEPARCO, the initiative enjoys the Patronage of the Ministry of Ecological Transition. https://www.arteparco.com/audioguida-2023/
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The lake of Posta Fibreno, also known as lake of the Post, is located in the Comino Valley on the border of Lazio with Abruzzo and Molise, in the middle valley of the Liri, in the center of the homonymous reserve in the province of Frosinone, the Lazio side of the National Park of Abruzzo, Lazio and Molise. Source: https://it.wikipedia.org/wiki/Lago_di_Posta_Fibreno
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The lake of Posta Fibreno or della Posta, a nature reserve, is one of the most beautiful, characteristic and unspoiled natural oases in all of central Italy. Included in the green Valle di Comino, this huge source of pure water, coming from the slopes of the nearby mountains of the Abruzzo National Park, gives life to the icy and clear Fibreno river. Singular peculiarities of the lake are the floating island and the ancient boat with a flat bottom. The small trout called "Carpione del Fibreno" (endemic) and the rare macrostigma trout find their natural habitat here. The lake has always been frequented by scuba divers or free diving and by birdwatching enthusiasts.
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The nature reserve Lago di Posta Fibreno is a protected natural area located in the municipality of Posta Fibreno, in the province of Frosinone. It is known for the presence of a floating island already mentioned by Pliny the Elder in his Naturalis historia (source: Wikipedia https://it.wikipedia.org/wiki/Riserva_naturale_lago_di_Posta_Fibreno).
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The most prominent natural feature is the Lake Posta Fibreno, a crystal-clear karstic lake known for its unique floating island, 'La Rota'. Another significant feature is Fossa Maiura, a gigantic karst sinkhole approximately 100 meters deep, which is the origin of the Fibreno river's waters.
Yes, the Lake and Nature Reserve of Posta Fibreno is a haven for biodiversity. You can spot over 100 species of birds, making it excellent for birdwatching. The lake is also home to the Carpione del Fibreno, a fish species found only here, along with other wildlife like foxes, otters, and various aquatic plants.
Yes, for elevated views, consider visiting Punta Mazza. This summit, reaching 1776 meters, offers extensive views of the surrounding mountains and valleys, including Sora and the Lepini Mountains.
The area around Posta Fibreno offers a variety of hiking trails. You can find easy walks like the 'Submerged Cross loop from Posta Fibreno' or the 'Lake Posta Fibreno loop from Posta Fibreno'. For more options, explore the Hiking around Posta Fibreno guide, which includes routes like 'Gole di Lacerno – National Park of Abruzzo, Lazio and Molise'.
Absolutely. The Lake Posta Fibreno is considered family-friendly, offering opportunities for pedal boating and easy nature trails. The reserve also has equipped nature trails and huts for birdwatching, which can be engaging for children.
The natural monuments, particularly the Lake and Nature Reserve, are enjoyable throughout much of the year. Spring and autumn offer pleasant temperatures for hiking and wildlife observation. The lake's waters maintain a nearly constant temperature, making it suitable for activities like scuba diving even outside peak summer.
Yes, the region supports various outdoor activities. You can find MTB trails around Posta Fibreno, including loops around Lake Posta Fibreno. There are also cycling routes, such as the 'Cascata del Liri, Acropoli di Civitavecchia e Lago di Posta Fibreno — ring tour'.
The 'floating island,' locally known as 'La Rota,' is a unique natural phenomenon at Lake Posta Fibreno. It's composed of peat, roots, algae, and shrubs, and it constantly changes its position across the lake surface, driven by winds and currents. This captivating feature has been noted since ancient times.
While primarily natural, the area integrates art with nature through projects like Arteparco. You can find installations such as Arteparco Totem – Accademia di Aracne and Rinascita by Megx (2024) within the broader National Park of Abruzzo, Lazio and Molise, offering a blend of artistic beauty and natural landscapes.
While specific public transport routes directly to all natural monuments may vary, the Lake and Nature Reserve of Posta Fibreno is the central point of interest. It is advisable to check local bus schedules or consider driving for more flexibility in exploring the wider area.
The Lake Posta Fibreno stands out due to its crystal-clear karstic waters, fed by underground springs from the Apennine Mountains, which maintain a constant cool temperature. Its most unique feature is 'La Rota,' the natural floating island, and it's also the exclusive habitat of the endemic Carpione del Fibreno fish.


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