World Rivers Day
World Rivers Day is held on September 27. Last Sunday of September. This event in the third decade of the month September is annual. 
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The Nile River is widely accepted as the world's longest river. Most scientists agree that the Amazon River comes in a close second, winding a huge 6,840km through the mountains and rainforests of South America.
World Rivers Day is celebrated on the fourth Sunday of September every year to increase public awareness about rivers and to encourage their conservation. The day celebrates Earth's waterways, in which over 60 countries participate every year.
Similar holidays and events, festivals and interesting facts
World Environmental Health Day on September 26
International Rabbit Day on September 26 (Held on the fourth Saturday in September);
European Mushroom Day on September 26 (Celebrated on the fourth Saturday of September);
European Day of Languages on September 26 (European Union);
National Public Lands Day in USA on September 26 (Held on the fourth Saturday in September);
World Retina Day on September 27 (Held on the last Sunday in September);
European Myeloma Day on September 27
International Daughters' Day on September 27 (Celebrated on the fourth Sunday of September);
National Crush Day in USA on September 27 (It’s a reminder that recycling reduces carbon emissions, saves money, and cuts down on waste. National Crush Day is an opportunity for those who care about the environment to advocate for recycling);
National Environmental Awareness Day in Argentina on September 27
International Safe Abortion Day on September 28 (The day was first celebrated as a day of action for decriminalization of abortion in Latin America and the Caribbean in 1990 by the Campaña 28 Septiembre);
International Right to Know Day on September 28
International Day for Universal Access to Information on September 28 (Universal access to information means that everyone has the right to seek, receive and impart information. This right is an integral part of the right to freedom of expression);
International Poke Day on September 28
World Marmite Day on September 28