Guinness's world's smallest parkAs for the world title, Guinness hasn't budged and Portland's Mill Ends Park has kept its title since first receiving it in 1971.
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The world's smallest park, Mill Ends Park, is located in the median of SW Naito Parkway in downtown Portland.
What Is the Largest Urban Park in the World? The largest park in the world contained within a metropolitan area and the largest urban park in the U.S. is Chugach State Park in Anchorage, Alaska. It is the largest city park in America by far, spanning 495,199.2 acres.
States without National Parks are: Alabama, Connecticut, Delaware, Georgia, Idaho (see above,) Illinois, Iowa, Kansas, Louisiana, Maryland, Massachusetts, Mississippi, Nebraska, New Hampshire, New Jersey, New York, Oklahoma, Pennsylvania, Rhode Island, Vermont, and Wisconsin.
Bogd Khan Uul National Park, Mongolia (1783)Many mistakenly think America's Yellowstone National Park is the oldest in the world but there's one that was created a century earlier. Established by the Mongolian government in 1778, the area surrounding Bogd Khan Uul Biosphere Reserve is actually the oldest in the world.
Yosemite National Park, USA (1890)Located in California's Sierra Nevada, it is one of the oldest, largest, and best-known national parks in the United States.
The smallest park is Gateway Arch National Park, Missouri, at 192.83 acres (0.7804 km2). The total area protected by national parks is approximately 52.4 million acres (212,000 km2), for an average of 833 thousand acres (3,370 km2) but a median of only 220 thousand acres (890 km2).