Landscape of the Gelsa river plain Nature · Gelsa, Ribera Baja del Ebro, Zaragoza Image of Gelsa, not of the place itself. Gelsa, at 147 m of altitude on the banks of the Ebro, in the Ribera Baja del Ebro, bases its economy on irrigated agriculture with maize, alfalfa, peach and almond as its main crops, alongside rainfed cereal farming and a gypsum and plasterboard industry. Photo: Ecelan (CC BY-SA 4.0) What to see and do in Gelsa