What desert has geological features known as ergs reg and hamadas?
The Sahara Desert.
Egypt is predominantly desert. Only 35,000 square kilometers- -3.5 percent of the total land area--are cultivated and permanently settled. Most of the country lies within the wide band of desert that stretches from Africa's Atlantic Coast across the continent and into southwest Asia. Egypt's geological history has produced four major physical regions: the Nile Valley and Delta, the Western Desert (also known as the Libyan Desert), the Eastern Desert (also known as the Arabian Desert)…
The Llano Estacado, commonly known as the Staked Plains but perhaps more accurately interpreted as the "palisaded" plains in geological terms, is the southern extension of the High Plains of North America and lies south of the Canadian River in northwest Texas and northeast New Mexico. it is not a true desert but is chiefly semi arid grassland.