National Public Lands Day in USA
National Public Lands Day in USA is held on September 23. Held on the fourth Saturday in September. This event in the third decade of the month September is annual. 
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National Public Lands Day is organized annually and led by the National Environmental Education Foundation, in partnership with the National Park Service and other federal agencies.
Established in 1994 and held annually on the fourth Saturday in September, National Public Lands Day is traditionally the nation's largest single-day volunteer effort. It celebrates the connection between people and green space in their community, inspires environmental stewardship, and encourages use of open space for education, recreation, and health benefits.
Similar holidays and events, festivals and interesting facts
National Elephant Appreciation Day in USA on September 22
World Rhino Day on September 22
World Protection Elephant Day on September 22
European Mushroom Day on September 23 (Celebrated on the fourth Saturday of September);
International Rabbit Day on September 23 (Held on the fourth Saturday in September);
World Rivers Day on September 24 (last Sunday of September);
World Environmental Health Day on September 26
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