Grotta Tanaccia

Beneath the gypsum ridge behind Brisighella lies the Tanaccia, a notable cave of the Vena del Gesso Romagnola. Its chambers, collapse hall and underground pool form part of a karst landscape inscribed on UNESCO's World Heritage List in 2023.

Why it matters

Gypsum caves are rare: the rock dissolves and collapses more readily than limestone, so large voids survive only in particular conditions. The Tanaccia is one such cave within the serial World Heritage property inscribed in 2023 for the evaporitic karst and caves of the northern Apennines. Its underground geology connects with the visible gypsum formations, quarries and historic trade of Brisighella.

What to notice

The Sala delle Sabbie contains mineral concretions formed by water. The Salone di Crollo reveals how the caves evolve as ceilings fail and boulders accumulate. The Sala del Laghetto contains a shallow underground pool, while the Sala Piatta formed where two large gypsum blocks parted. Selenite, darkness and dripping water give the cave a geological character distinct from limestone systems.

Context and history

The cave formed within evaporite deposits of the Vena del Gesso, a gypsum ridge raised about six million years ago along the Apennine margin. Evidence recorded by the municipality indicates prehistoric human presence reaching back to the Copper Age. Protection came in stages: the regional park was established in 1994, and in September 2023 UNESCO inscribed the serial property Carsismo e grotte nelle evaporiti dell'Appennino settentrionale, which includes the Vena del Gesso Romagnola and its caves.