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The Mefite is considered one of the largest and oldest cold natural carbon dioxide springs globally. It's an exceptional non-volcanic CO2 degassing site, with continuous emissions of carbon dioxide and hydrogen sulfide from the subsoil. This phenomenon creates a constantly bubbling, muddy lake and a barren, sulfur-stained landscape, making it a significant natural laboratory for scientific study.

Due to the high concentration of dangerous gases, there are no specific hiking trails directly around the Mefite lake itself. Visitors are advised to maintain a safe distance and observe all marked danger signs. However, the broader Valle d'Ansanto region offers numerous trekking paths for hikers to explore the surrounding natural and cultural landscape.

The Mefite has a rich ancient history, revered by the Osci and Samnites as early as the 7th century BC. It was the site of a sanctuary dedicated to the goddess Mefitis, associated with spring waters, fertility, and the underworld. Ancient authors like Virgil, Cicero, and Seneca described it as an "entrance to the Underworld" or "the breath of Dis" due to its deadly exhalations, highlighting its deep roots in local mythology and belief systems.

While the Mefite is a fascinating natural wonder, extreme caution is necessary, especially with children. The high concentration of gases near the lake makes the immediate vicinity dangerous. It's crucial to keep children close, ensure they understand the safety warnings, and stay strictly behind marked barriers. The surrounding area offers more suitable, safer paths for family walks.

Given the lethal nature of the gases, particularly at ground level where animals are more susceptible, it is strongly advised not to bring dogs or other pets close to the Mefite lake. The high concentration of carbon dioxide and hydrogen sulfide poses a significant health risk to animals.

Despite the harsh conditions, the Mefite supports unique extremophile life. Specialized flora, such as a rare variety of broom called Genista anxantica (named after the valley), manages to survive at the crater's edges, adapting to the acidic and inhospitable soil. Some extremophile algae also thrive in the lake's unique environment.

A visit to the Mefite itself, observing the lake from a safe distance, typically takes about 30 minutes to an hour. If you plan to explore the surrounding trails in the Valle d'Ansanto or visit nearby Rocca San Felice, you should allocate more time, perhaps a half-day or full day.

The Mefite is located about 4 km from the town of Rocca San Felice in the province of Avellino. The most convenient way to reach it is by car, as public transport options are limited in this rural area. Parking is generally available near the site, but it's advisable to arrive earlier in the day, especially during peak season, as spaces can fill up quickly.

While there are no direct facilities at the Mefite site itself, the nearby town of Rocca San Felice offers various options for visitors. You can find local restaurants (ristoranti) serving traditional cuisine, as well as accommodation choices including farm stays (agriturismo) and hotels, providing a base for exploring the region.

Given the potentially uneven and sulfur-stained terrain, sturdy, closed-toe footwear is highly recommended. Dress in layers, as weather conditions can change, and consider sun protection. While the immediate area is barren, if you plan to hike in the surrounding valley, appropriate hiking attire is advisable.

Yes, the Mefite is sometimes referred to as a "seismic sentinel." Reports suggest that the gas emissions from the Mefite can increase or decrease before seismic events, making it a point of interest for geologists studying earthquake prediction and tectonic processes in the southern Apennines.