Qanat of Ajalvir Curiosity · Ajalvir, Cuenca del Medio Jarama, Madrid Image of Ajalvir, not of the place itself. Beneath the urban core a qanat is preserved, the underground drainage gallery of Arab origin with which groundwater was captured. The village's place name itself comes from Arabic and alludes to a wide pass or well between hills. Photo: Dirección General de Turismo. Consejería de Economía e Innovación Tecnológica. Comunidad de Madrid. (CC BY 3.0 es) What to see and do in Ajalvir