Postcard from the USA!

Today I got a cool postcard from the USA! The postcard shows multiple interesting views of the sand dunes at the Great Lakes. The Great Lakes contains the largest freshwater dune complex in the world, with over 275,000 acres in Michigan. They were formed when the glaciers retreated many years ago. This left a lot of sand deposits and lead to the development of these dune formations. Used were some great basketball stamps! Thanks Derek!