"Water unites us!!" is a KA219 Erasmus+ strategic partnership among Croatia, Greece, Italy, Latvia, Portugal and Turkey. Our students aim to explore the various biotic and abiotic environmental parameters of certain aquatic ecosystems (AQUE). In addition they intend to record and mark out the sport activities, which are carried out while they are used as well as the local history and culture. Very often, though, human activities disturb ecological balance. Finishing our project, we hope to have sensitized the local communities and the authorities to take measures for a rational use of the AQUE aiming to their sustainance.