Henares canal as it passes through Marchamalo Nature · Marchamalo, La Campiña, Guadalajara Image of Marchamalo, not of the place itself. The canal crosses the town centre of Marchamalo and divides it in two, in a setting of fertile lowland on the right bank of the Henares. It is an irrigation canal of about 40 kilometres that allows some 7,800 hectares to be irrigated between the left bank of the canal and the right bank of the river. It was already planned in the 18th century by the Count of Aranda under Charles III; the concession was granted to the Sociedad Ibérica de Riegos in 1859, the route was modified in 1863 and 17 kilometres were opened in 1867. Works resumed after 1926 under the Confederación del Tajo, until its definitive inauguration in 1954. Photo: Ignacio Pérez Anguio (CC BY-SA 3.0) What to see and do in Marchamalo