If you're looking for the flattest place on earth, there are few options that can compete. Bolivia is home to Salar de Uyuni, the largest salt flats in the world, and it's a must-visit for travelers who appreciate the beauty of empty land.

If salt flats aren't your cup of tea, there are also mudflats to be found in Germany's Wadden Sea. You can hike or take an airboat ride to check out this unique feature.

The smallest country in Africa, the Gambia, is also among the continent's flattest countries. Its low elevation means that it's vulnerable to rising sea levels caused by climate change.

Tuvalu, a speck of an island nation in the Polynesian archipelago between Hawaii and Australia, also ranks among the flattest nations. Its tiny 26-square-kilometer landmass has a 5 m difference between its highest and lowest points.

In America, Florida is one of the flattest areas. Its Everglades National Park is a popular destination, but you can also kayak and rent an airboat to explore the area.

You can also visit the Bassas da India atoll, tucked between Mozambique and Madagascar. This incredibly flat, uninhabited atoll is located in the channel that connects these two countries and can be reached by boat or plane.

In addition to the flatness of these areas, they all follow the contours of the spheroid shape of the Earth. This is why they are sometimes referred to as "flat plains."