Islamabad features an
atypical version of a humid subtropical climate, with warm and dry springs, hot
and humid summers accompanied by a monsoon season, and brief but cool winters.
Islamabad's micro-climate is regulated by three artificial reservoirs; Rawal, Simli,
and Khanpur Dam. Khanpur Dam is located on the Haro River near the town of Khanpur,
about 40 kilometers (25 mi) from Islamabad. Simli Dam is located 30
kilometres (19 mi) north of Islamabad. 220 acres (89 ha) of the city
consists of Margalla Hills National Park. Loi Bher Forest is situated along
