The tallest sand dunes would be found in the Sleeping Bear national lake shore in Michigan,USA. The Sleeping Bear Dune is listed at1024ft/312m also in the park on South Manitou Island a dune at 1014ft/309m and on North Manitou Island a dune at 1001ft/305m. my source is the National Park Service, U.S. Dept. of the Interior map of the park and also personal experience at the park.
The biggest sand dunes are in Algeria in the Sahara Desert. They are up to 430m (1,411 ft) high, nearly three times the height of the Greatest Pyramid
Nebraska Sand hills are the largest by area. The tallest sand dunes in North America are in Colorado at Great Sand Dunes National Park.
The Algodones Dunes is a large sand dune in southeastern California. The field is approximately 45 miles long by 6 miles wide.
Colorado
the largest sand dunes
Yes. I know for certain there are dunes in Indiana, and also in southern California; there are also probably many other places. The tallest sand dunes in North America are in Colorado
Silver Lake Sand Dunes and Sleeping Bear Dunes
In most deserts, sand dunes are only a small area covered by the desert.
New Zealand has essentially only coastal sand dunes, we do not have giant dunes such as Big Red in Australia, or the big one in north America. (whose name I don't know).
Large piles of sand are called dunes.
There are large sand dunes located all over the world. Some of the largest dunes are located in France, China, Colorado, Namibia, Algeria, and Australia.
There are only two sand dunes in Michigan. The two sand dunes are Sleeping Bear Dunes and Sliver lake sand dunes.
Sossusvlei, Namibia is the African country home to the world's largest sand dunes.
sand dunes change
Yuma
Sleeping Bear Dunes National Lakeshore is located in Northwestern Lower Michigan along the eastern shoreline of Lake Michigan. The closest city is Traverse City, 25 miles to the east. See link below.