On 13th April the pupils of Primary 6th level went on a free school trip organized by English departament to know the rivers Isàvena and Éssera valleys, that suppy water to the Aragon and Catalonia Canalt. We visited six medieval bridges, the Ovarra monastery, the medieval village of Roda and the historic buildings of Graus. The complete activity was in English (Science): infomation, explanationsand evaluation, included in the school interdisciplinary project