1. River, Mountains
Tinayguk River, Gates of the Arctic National Park and Preserve, Alaska
Photograph by Michael Melford

2. Mountain
Mount Doubletop, Baxter State Park, Maine

3. Mountains
Dingle, Ireland

4. Freshwater Marsh
Okavango Delta, Botswana
The world’s largest freshwater marsh, where the Okavango River meets the Kalahari desert
Photograph by Lorenzo Manni, MyShot

5. Rocky Coast
Monhegan Island, Maine
A coastline is the area where land meets sea or ocean.

6. Beach, Cliffs, Plain
Dunmore Head, Dingle Peninsula, Ireland
A beach is a narrow strip of land that lies along a body of water.

7. Sandstone Spire, Cliffs
Spider Rock, Canyon de Chelly, Arizona
A cliff is a steep, near-vertical rock exposure, formed by erosion and
weathering
Photograph by Bill Hatcher

8. Butte
The “Lighthouse,” Palo Duro Canyon, Texas
An isolated hill with steep sides and a flat top, smaller than a mesa, formed by erosion
Photograph by Anthony Boyer, MyShot

9. Canyon
Grand Canyon Valley
A canyon is a deep, narrow valley with steep sides,
created by the movement of rivers, erosion and weathering.
Photograph by Barry Tessman

10. Natural Arch
Delicate Arch, Arches National Park, Moab, Utah
Formed by erosion and weathering
Photograph by Mlcreech

11. Mesa
“Great White Throne,” Zion National Park, Utah
A mesa is a flat-topped mountain, this one made of limestone.
Photograph by James P. Blair

12. Cliff
Inishmore, Ireland
A cliff is a steep, near-vertical mass of rock, this one made of limestone

13. Bayou
Adams Bayou, Orange, Texas
A slow-moving body of water

14. River Bed
Colorado River Bed, Grand Canyon
Photograph by Wilbur E. Garrett

15. Waterfall, Cliffs, Island
Baffin Island Waterfall, Nunavut, Canada
Photograph by Paul Nicklen

16. River, Canyon, Plateau
Owyhee River, Idaho
Photograph by Michael Melford, National Geographic, aerial support from Lighthawk

17. Sand Dunes
Sand dunes of Khongoryn Els, Gobi Gurvansaikhan National Park, Ömnögovi Province, Mongolia
Crescent-shaped sand dunes are created by winds that blow continuously from one direction
Photograph by Doron

18. Desert
Tecopa, Mojave Desert, California
Evaporation of a flooded dry lake caused these cracks in the mud.
Photograph by Lorenzo Manni, MyShot

19. Sand Dunes and Hills
Inishowen, Ireland
Photograph by Dave Johnston, YourShot

20. Plains
Sichuan, China
A plain is a broad area of flat land.
Photograph by Xi Luo, MyShot

21. Hills
Painted Hills, Oregon
Land that rises above its surroundings and has a rounded summit
Photograph by Michel Hersen, MyShot

22. Geyser
Castle Geyser, Yellowstone National Park
A geyser is a natural hot spring that sometimes erupts with water or steam.
Photograph by Brocken Inaglory

23. Volcanoes
Mount Semeru, Java
An opening in the earth’s crust from which hot magma, volcanic ash, and gas erupt.
Photograph by John Stanmeyer, National Geographic

24. Volcanic Crater
Santa Ana Volcano, El Salvador
A circular depression caused by volcanic activity