The poplar and willow banks of the Guareña Nature · Vadillo de la Guareña, La Guareña, Zamora Image of Vadillo de la Guareña, not of the place itself. Poplars, ash and willows accompany the river as it passes through the municipal district, where otters, herons and night herons have been recorded; the continental Mediterranean climate leaves here between 400 and 500 millimetres of rain a year. Photo: FLAVIVSAETIVS (CC BY-SA 4.0) What to see and do in Vadillo de la Guareña