The area of Islamabad is . A further area is known as the Specified Area, with the Margala Hills in the north and northeast. The southern portion of the city is an undulating plain. It is drained by the Kurang River, on which the Rawal Dam is located.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 from Islamabad. Simli Dam is located north of Islamabad. of the city consists of Margalla Hills National Park. Loi Bher Forest is situated along the Islamabad Highway, covering an area of .