The 100 biggest islands range from the likes of expansive Greenland to independent Guadalcanal, the largest of the Solomon Islands. But look a little closer, and you’ll see just how much the top contender outshines the rest. Greenland is almost three times the size of the second-biggest island of New Guinea, and you could fit over 408 Guadalcanal islands within it.

Quite a few islands around the world are very large, and many of them are countries. Australia is technically an island because it is unconnected to any other body of land, but it is more commonly considered a continental landmass. Of the seven continents, Australia is the smallest, at 2,969,976 square miles, or 7,692,202 square kilometers.

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Source: U.S. Geological Survey, World Economic Forum

Rivers are defined as natural flowing freshwater bodies that move from a high elevation to a lower elevation, finally draining into oceans, lakes, seas, or other rivers. It is challenging to precisely determine the world's longest river from so many long rivers located throughout the different continents of the planet.

Although most of us believe that the Nile River is the longest, some scholars have claimed that the Amazon River is the longest of all rivers. In 2009, a peer-reviewed article published in the "International Journal of Digital Earth" cleared the confusion and declared the Nile River - the longest river in the world.

This is a list of the top 10 longest rivers on Earth. It includes river systems over 1,000 kilometers (620 mi).

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Source: USGS, Wikipedia