The mountain area of Phawngpui is at most times covered by a thin stretch of clouds, which makes it blue in appearance from a distance, hence the name Blue Mountain. The temperature therefore is mild throughout the year ranging from 11-29°C, with an average rainfall of 3,000 cm. It overlooks the major river Chhimtuipui flowing towards Burma. The edges of the mountains are all very steep and mostly of sharp precipices, and the most spectacular is a semi-circular beautiful cliff on the western side called Thlazuang Khâm, which has a blunt and deep fall. The mountain ridge runs in a north-south direction covering about 10 km. The closest human settlement is Thaltlang village at the base and periphery of the park.