Objective: To study the physical and chemical characteristics of the Tagus River water. Main activities: Presentation of project teams Presentation of the Schools Presentation of the cities Presentation of the countries - Collect water from the Tagus river at different times; - Analyze some physical and chemical characteristics of the collected water samples. - Discuss the variation of physical and chemical properties of samples. This project is a transdisciplinary and multidisciplinary project in which it combines scientific and artistic activities in a harmonious way, in order to give the students the chance to show their skills.