The grandest canyon in the world may not be the one you may have heard of. In 2013 researchers discovered a canyon in the world that was, in fact, over 50% longer than the Grand Canyon in Arizona, USA. How did we not discover such a massive canyon until very recently? Simple. It was buried under a 2 km deep ice sheet in Greenland.
Tentatively named the “Grand Canyon of Greenland”, scientists from the university of Bristol have described the discovery as a mega-canyon. The canyon is more than 750 kilometers (466 miles) long, comparatively the Grand Canyon in Arizona is 446 kilometres (277 miles) long and no other canyon on earth comes close to its length.