Encompassing parts of Saudi Arabia, Oman, the United Arab Emirates and Yemen, is the desert known as Rub' al Khali. Commonly known as the Empty Quarter, the land is actually a part of the much larger Arabian Desert. However, the Empty Quarter sets itself apart from the larger whole in the amount of its area that is covered with sand. In fact, it is the largest contiguous sand desert in the entire world.
Recently, a strange natural phenomenon was observed in the Empty Quarter by some of the locals. Shown in the video below, the sands have started to move in a way that is characteristic of a river. What's even more bizarre is that the man in the video reaches in and pulls out chunks of what has been confirmed to be hail.