Vallesa de la Guareña is a municipality located in the province of Zamora, Castile and León, Spain. According to the 2015 census (INE), the municipality has a population of 106 inhabitants.Main sightsThe Church of San Juan Bautista.The Mudéjar Church of San Andrés in Olmo de La Guareña from the 13th century, recently protected as B.I.C.