The lake is meromictic, meaning its water layers do not mix, leading to distinct chemical and biological conditions at different depths.
It sits at an altitude of approximately 50 meters above sea level but reaches depths of over 20 meters.
The name 'Accesa' is linked to local folklore describing the water as 'lit' or 'flaming' due to the way sunlight reflects off its mineral-rich surface.
The site was an important hub for the mining of silver and iron in the Etruscan era.
The lake's clear, still water is primarily fed by the Bruna River's underground aquifers.
Lago dell'Accesa is a small, spring-fed meromictic lake located in the heart of the Tuscan Maremma. It is characterized by its deep, emerald-green waters that maintain a relatively constant temperature year-round. The lake is situated in a depression formed by karst phenomena, specifically the dissolution of gypsum and limestone rock. Archaeological excavations nearby have revealed evidence of Etruscan settlements dating back to the 7th century BCE. The water is supplied by subterranean springs, and the lake maintains a stable level despite its lack of visible surface tributaries. It serves as a local recreational site with designated swimming areas. The surrounding vegetation consists of Mediterranean scrub and woodlands.
The wooden boardwalks and small jetties along the northern shore offer the best vantage point for capturing the emerald water against the forest backdrop.
Bring water shoes, as the lake bottom can be rocky and slippery near the entry points.
Pack mosquito repellent, as the surrounding wooded areas are prone to insects during summer afternoons.
Arrive early to secure a parking spot near the access paths, as space is limited during peak summer weekends.
Do not attempt to swim in areas marked as restricted, as these zones are often protected for ecological research.
Respect the natural ecosystem by avoiding the use of chemical sunscreens in the water; carry out all trash to keep the area clean.
