Festivities of invierno de Mezalocha Activity · Mezalocha, Campo de Cariñena, Zaragoza Image of Mezalocha, not of the place itself. Mezalocha's winter festival is held beside the reservoir on the river Huerva built in 1903, also called the presa de Marimarta, with 180 hectares of water surface. Photo: 19Tarrestnom65 (CC BY-SA 4.0) What to see and do in Mezalocha