Dnieper Day is an unofficial ecological observance celebrated in Russia, Ukraine, and Belarus on the first Saturday in June. The day aims to address environmental issues related to the Dnieper River, which flows through these three countries and is one of Europe's major rivers. It is recognized for its significance in Ukrainian culture and economy, as it serves as a vital navigable waterway and supports hydroelectric stations that generate a substantial portion of Ukraine's electricity. On Dnieper Day, volunteer groups organize cleanup activities to combat pollution and eutrophication affecting the river. The Dnieper is also a symbol of national identity for Ukraine, with many geographical names associated with it.