The term 'desert landforms' refers to the various shapes and formations that can be found in desert regions. Two of the most common desert landforms are ARCHES and mesas. ARCHES are large, curved rock formations that are often found in desert areas. They are formed by erosion and can be seen in many national parks. Mesas are flat-topped hills or mountains that are also found in desert regions. They are formed by erosion and are usually surrounded by steep cliffs.