The driest place on Earth is in Antarctica in an area called the Dry Valleys, which have seen no rain for nearly 2 million years. There is absolutely no precipitation in this region and it makes up a 4800 square kilometer region of almost no water, ice or snow.  While some areas of the Atacama along the coast have succulent plants like cacti, the more arid parts of the desert have no vegetation. These parched regions do not even have cyanobacteria – green photosynthetic microorganisms that live in rocks or under stones in most other deserts.

Source: NCERT