The US Postal Service has taken a peculiar interest in its latest commemorative stamp collection—waterfalls.

12 news stamps attempt to communicate the majesty of the nation's most beautiful cascades, from Virginia to Washington State to Hawai'i.

Many may recognize Niagra Falls or Lower Yellowstone Falls, but not all of them are large cataracts. There are smaller, more intimate trickles by comparison, just as beautiful but in their own way, such as Harrison Wright Falls in Ricketts Glen State Park, Pennsylvania.

"The Postal Service is proud to celebrate the natural world through our stamps, and these gorgeous new stamps will bring the beauty of these waterfalls to millions of people who will see them on the cards and letters they receive in their mailboxes," said Michael J. Elston, Secretary of the Board of Governors, U.S. Postal Service, who served as the stamps' dedicating official.

The Postal Service also included a detailed description of the various classifications of waterfalls in case you were curious.

"One of the most familiar types is the plunge, where the stream falls vertically without making contact with the underlying cliff face; sometimes there are caverns behind the falls carved by earlier erosion."

"As the name suggests, a fan waterfall resembles the shape of a fan as the flow spreads down the rocks. Other types include the cascade, which breaks into smaller falls as the water descends over a slope of rocks and boulders, and the cataract, where large amounts of fast-moving water plummet over a cliff to create a waterfall of great size and power."

The stamps debuted on June 13th at the canyon visitor center in Yellowstone National Park. They include the following…

Deer Creek Falls (Grand Canyon National Park, AZ) plunges 180 feet into a pool at its base. On foot, it is a strenuous hike for experienced desert backpackers, but it is also accessible as a stopping place on rafting trips along the Colorado River.

Nevada Fall (Yosemite National Park, CA) is one of hundreds of waterfalls in the park. It flows next to Liberty Cap, a dramatic granite dome, and drops 594 feet along the mountainside.

Harrison Wright Falls (Ricketts Glen State Park, PA) drops 27 feet over a rock ledge, where it spreads to create a curtain-type fall flowing into a large pool at the base.

The Lower Falls of the Yellowstone River (Yellowstone National Park, WY) has a 308-foot drop. Nearly twice as high as Niagara Falls, the sheer volume of water that descends the cliffs makes it one of the most powerful waterfalls in the United States.

Waimoku Falls (Haleakalā National Park, HI), with its dramatic 400-foot drop down sheer lava-rock, is one of the park's great highlights.

Stewart Falls (Mount Timpanogos Wilderness, UT) falls in two tiers and is more than 200 feet tall. Also known as Stewarts Cascades, it is a moderate, slightly steep hike along a lovely forest trail on the east side of Mount Timpanogos.

Niagara Falls (Niagara Falls State Park, NY) is one of North America's natural wonders. Its force is enormous: 3,160 tons of water flows over the falls every second.

Dark Hollow Falls (Shenandoah National Park, VA) plunges 70 feet over a series of drops. It is a popular subject for photographers visiting the park.

Grotto Falls (Great Smoky Mountains National Park, TN) is the only one in the park that has a hiking trail behind the veil of falling water. The 25-foot falls is along one of the park's most popular hikes.

Sunbeam Falls (Mount Rainier National Park, WA), while not high, features picturesque cascades of water flowing over a series of rock ledges. It is most impressive when fed by snowmelt.

LaSalle Canyon Waterfall (Starved Rock State Park, IL) features a 25-foot fall that allows access behind its curtain of water. In winter, it freezes into beautiful and alluring shapes along the rocks.

Upper Falls (Blue Ridge Parkway, NC) is a moderate hike from the parkway. The 60-foot waterfall descends the steep rock face, sending out sprays that support many types of ferns and wildflowers.

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