Maryland officials Wednesday unveiled the new 39-cent Chesapeake Bay stamp, part of the 40-stamp “Wonders of America: Land of Superlatives” collection released by the United States Postal Service this week.

The collection includes stamps that commemorate America?s marvels ? from the biggest rodent to the windiest city. The Chesapeake Bay made the list because it is the country?s “largest estuary,” the largest body of water where fresh and salt water mix.