You know "The Mountain" from "Game of Thrones," but the real-life mountains (and rivers, valleys, etc.) usually have more descriptive names. Can you name these geographic features?
From sea level to peak, Mt. Everest is the world's tallest mountain. It stands 29.029 feet tall, so high that most climbers need supplemental oxygen to survive on the summit.
The Great Barrier Reef stretches for around 1,400 miles along the coast of Australia, and it's so big that it can be seen by astronauts in orbit. Sadly, warming ocean temperatures are killing the reef at an unprecedented rate and may permanently destroy this magnificient feature.
The Amazon River, in South America, is the longest river on Earth. It flows for nearly 4,350 miles. By comparison, the United States (the world's fourth largest country) is just 2,680 miles wide.
The Rocky Mountains stretch throughout much of the United States and Canada -- as Canadians know, the northern stretch is perhaps more spectacular than the peaks in America.
The Grand Canyon is an epic canyon that severs the Earth's crust in Arizona. It's around 280 miles long and in some places, it's 1 mile deep.
Off of the coast of Ireland, you can see the Giant's Causeway, a series of tens of thousands of rock columns which were formed by a volcanic eruption long ago. Many of the columns have a distinct hexagonal shape.
The Yangtze, located in China, is the longest river in Asia. It is about 3,950 miles long, making it the third-longest river in the world.
The Pacific Ocean is a massive body of water that covers about one-third of the planet. Its water depths take up about 59 million square miles … so if you really want to wind up on a deserted island alone, this is your best shot.
The Great Rift Valley is an enormous trench that stretches about 3,700 miles from Asia to Africa, where it splits into the East and West Rift Valleys. It was formed by two tectonic plates that are moving away from each other.
Eyjafjallajökull is a famous volcano located in Iceland. In April 2010, a major eruption here blasted tons of ash into the atmosphere, causing major disruptions to air travel.
The Missouri River begins as a trickle in western Montana and then morphs into a 2,341-mile-long behemoth that empties into the Mississippi River at St. Louis. It is America's longest river.
The Mariana Trench -- specifically an area called the Challenger Deep -- is the deepest place on Earth. It is more than 36,000 feet below the ocean waves. If you could plop Mt. Everest into the Deep, its summit would still be about 1 mile below the surface.
Asia is -- by far -- the largest continent in the world. It covers more than 17 million square miles. It's so large that it spans 11 time zones.
Lake Victoria is the biggest lake in all of Africa, and most of this gargantuan body of water rests in Uganda and Tanzania. It sprawls for nearly 27,000 square miles. English explorer John Speke named it for Queen Victoria in 1858.
The Alps is a major mountain range in south-central Europe. Sometimes you can hear people yodeling there.
Angel Falls in Venezuela is one of Earth's most amazing sights -- this waterfall is more than 3,200 feet tall. It's the tallest waterfall on the planet.
At one point it was called Mt. McKinley, but now it's been returned to its native moniker -- Denali. As the tallest peak in North America, it is 20,310 feet high, so tall that clouds often obscure the summit.
The Caspian Sea is the world's biggest inland body of water -- and some people classify it as a lake. It has a surface area of more than 140,000 square miles, and in some places, it's nearly 3,400 feet deep.
The Twelve Apostles is a collection of limestone towers off the coast of Australia. The stacks are formed by erosion … and sadly, only eight of them are left standing in the harsh ocean waves.
North America is the third-largest continent on Earth. It spans nine time zones, two less than Asia.
Located in the Democratic Republic of the Congo, the Ituri Forest is so dense that it could trigger claustrophobia in some travelers. No wonder Joseph Conrad called it the "heart of darkness."
The Mississippi River is 2,320 miles long. It's part of the watershed for 31 states and two Canadian provinces, and it flows into the Gulf of Mexico at New Orleans.
Hudson Bay is an enormous bay in northeastern Canada. It is roughly 850 miles long and 650 miles wide, but given its huge area, it's really not very deep, maxing out at just more than 300 feet.
Antarctica is the biggest desert in the world, but you know, nobody really lives there, so it almost doesn't count. Once you exclude polar regions, Africa's Sahara Desert is the biggest, sprawling for more than 3 million square miles.
The Namib is a large coastal desert in southern Africa. It's so dry and inhospitable that almost no one even tries to live there.
By volume, Lake Baikal is the biggest freshwater lake in the world, and it is in Siberia. It's also the deepest lake -- in some places, it is nearly 5,400 feet deep. Lifejackets have never before seemed so futile.
The Ross Ice Shelf, named after Captain Sir James Clark Ross, who discovered it in 1841, is the largest ice shelf on the continent. It's nearly the size of France, and in some locations, it is perhaps 3,000 feet thick.
At 1,600 miles long, the Zambezi is the fourth-longest river in Africa. There, you'll find Victoria Falls, which when you consider its width and height, is the largest sheet of water anywhere on the planet.
The Kamchatka Peninsula, in the Russian Far East, is home to the volcanoes of Kamchatka, a UNESCO World Heritage Site. One of the most spectacular is Klyuchevskaya Sopka, which is more than 15,500 feet tall, making it the tallest active volcano in the Northern Hemisphere.
Mongefossen is the fourth-tallest waterfall on Earth. This Norwegian monstrosity has just one vertical drop -- 2,536 feet straight down.