Did you know there is a canyon bigger than the Grand Canyon?

Scientists have discovered a canyon in Greenland that is larger than the Grand Canyon. One problem: it is hidden beneath the ice in Greenland.

Here is a 3-D view.

The hidden canyon is up to half a mile deep, six miles wide and stretches for 466 miles beneath the country’s giant ice sheet.

Richard Gray writes,

It is thought to have been carved out by a meandering river more than four million years ago – at a time before ice covered the area and humans were just beginning to evolve from primates.

Similar work in Antarctica has also revealed enormous lakes and entire mountain ranges locked beneath the ice.

The canyon was discovered after scientists pieced together thousands of bits of data from airborne radar surveys.

Researchers have been flying over Greenland over the past two decades, beaming radio waves through the ice to image the rock beneath.