Thar desert spreads across Sindh (Pakistan) and Rajasthan (India). Its area in Pakistan is about 50,000 sqkm. It is the largest desert of Pakistan not the smallest.
Cholistan desert is located in Southern Punjab and spans over 26000 sqkm. It is widely known for Cultural festivals and Darawar fort.
Achro desert is located in Sindh province mostly in Sanghar and Nawabshah districts. it has an area of 32000sqkm.
Thal desert is located between Indus river and Jhelum river in the province of Punjab . Its area is approximately 10,000-23,000 sq km.
Hence comparing Thal with others proves that Thal is the smallest desert in Pakistan.