Pinnacles of sandstone among orange dunes of the Karnasai Valley, Chad -- George Steinmetz/Corbis
- This enormous sandpit is so large that it is almost the same size as Europe.""Can you guess which one it is?
- The nearest seaport to this sandy nation\s capital is more than 1,000 kilometres away.""No wonder they call it the Dead Heart of Africa
- It may seem hard to believe but this desert used to be much wetter and people lived here.""We know this because they left us these picturesque clues
- You may catch quite a thirst here but it is nothing compared to the driest place on Earth.""It has not rained there for more than 2 million years!