The Salsa del Dragone represents an emblematic example of a mud volcano in a complex geological setting, the northern Apennines of Italy, where fluid and mud emissions occur in poorly consolidated clayey soils and along permeable fracture systems. A modern reinterpretation of historical surveys allows the temporal range of study to be extended, providing new insights into the mud volcano’s dynamics. The surveys by Renato Biasutti (1906‑1907) document the site’s morphology, the arrangement of vents, and the characteristics of the mud, offering a valuable reference for comparison with the current situation. Recent campaigns, carried out between 2023 and 2025 within the PROMUD (PROtocol for MUD volcanoes) project, produced detailed data on the affected surface using UAV (Unmanned Aerial...