Pakistan experiences generally low rainfall, ranging from 125 mm per year in upper Sindh to approximately 900 mm in the northern sub-mountainous regions. In Balochistan, the average yearly precipitation is around 200 mm, decreasing to about ________ mm in the Kharan desert area:
Explanation
Rainfall in Pakistan is generally scarce, with Balochistan receiving an average of 200 mm annually. However, in the desert region of Kharan, this amount drops significantly to less than 50 mm.