Laguna de Arcas is a natural site that forms part of the Arcas-Ballesteros Lagoon Complex, a system of endorheic wetlands formed on Tertiary gypsum deposits in the province of Cuenca, Castilla-La Mancha. This unique geological complex comprises more than 35 sinkholes and uvalas, of which about 19 hold water permanently or temporarily, with depths ranging from 1 to 15 meters. The uniqueness of this site lies in its formation on gypsum rather than limestone, as is typical of most European karst wetlands. This gives it international scientific value due to the peculiarities of its groundwater circulation and the presence of highly sensitive submerged communities, particularly charophytes and ovales. From the visitor area, one can see an open agricultural landscape with gentle but highly distinctive topography, where bodies of water of varying sizes are scattered among wheat fields and pastures. The site offers a unique opportunity to observe the underwater meadows formed by aquatic plants beneath the surface of the lagoons, visible thanks to the clarity of the water. Outside, the flight of the marsh harrier and the black kite is a constant sight; the concentrations of the latter during the summer are spectacular, turning the place into a paradise for birdwatchers. Its significance lies not in its monuments, but in its geology and ecology: a fragile and ever-changing wetland protected as a Nature Reserve (Decree 27/2002) and a Special Area of Conservation, covering an area of 219 hectares spread across the municipalities of Arcas del Villar, Valdetórtola, and Villar de Olalla. The best time to visit is in the spring and fall, or immediately after rain, when the lagoons are fullest and the aquatic vegetation is most visible. In the summer, it’s best to avoid the middle of the day due to the heat and lack of shade.
