Aquifer 23 beneath the Llanos Nature · Llanos del Caudillo, La Mancha, Ciudad Real Image of Llanos del Caudillo, not of the place itself. The irrigation that gave rise to this town comes from Aquifer 23, the great underground reserve of the Mancha Húmeda whose overexploitation has shaped the recent history of the Manchegan wetlands. Photo: 19Tarrestnom65 (CC BY-SA 4.0) What to see and do in Llanos del Caudillo