What are the sand dunes present in thar desert?

The Thar Desert, located in northwestern India and eastern Pakistan, features several prominent sand dunes, including the high, crescent-shaped dunes known as "barchans." These dunes can reach heights of up to 150 feet and are shaped by prevailing winds. The desert's landscape is characterized by shifting sands, with some areas displaying extensive dune fields that create a dynamic and ever-changing environment. Additionally, the Thar Desert is home to a variety of flora and fauna adapted to its arid conditions.