The International Day of Rivers is observed each year on March 14, with the aim of raising awareness about the importance of rivers for both nature and society, and encouraging their conservation and sustainable management. This day highlights the vital role rivers play in sustaining life on Earth, as well as the challenges they face due to climate change, pollution, and changes in land use.
Rivers are dynamic ecosystems that connect mountainous, lowland, and coastal landscapes, enabling the flow of water, nutrients, and sediments. Numerous plant and animal species depend on rivers, and river habitats are among the most biodiverse areas within freshwater ecosystems.
In addition to their ecological role, rivers are of great importance to people. They are a source of drinking water, provide water for agriculture and industry, enable energy production, and play a key role in flood protection and landscape preservation. At the same time, they serve as spaces for recreation, cultural heritage, and local identity for many communities.
Despite their importance, river habitats worldwide are facing numerous pressures, such as pollution, hydromorphological alterations of watercourses, excessive water abstraction, and the loss of natural floodplains. For this reason, efforts aimed at preserving the natural dynamics of rivers, restoring degraded watercourses, and ensuring sustainable water management are becoming increasingly important.
Croatia has a rich network of rivers and streams that form the foundation of freshwater ecosystem conservation and represent an important part of the country’s natural heritage. Major rivers such as the Sava, Drava, Danube, and Kupa, as well as numerous smaller watercourses, shape the landscape and provide habitats for a wide range of plant and animal species.
Josip Juraj Strossmayer Water Institute plays an important role in monitoring the condition of river ecosystems through systematic surface water monitoring. By assessing the ecological and chemical status of watercourses, the Institute contributes to a better understanding of changes in river systems and to the planning of measures for their protection.
The International Day of Rivers reminds us of the importance of joint action—from scientific institutions and public policies to local communities—in order to preserve rivers and ensure their sustainable role for future generations.
