Balochistan is one of the four provinces of Pakistan. It is the largest province in terms of land area, forming the southwestern region of the country, but is the least populated. Its provincial capital and largest city is Quetta. Balochistan shares borders with Punjab and the Khyber Pakhtunkhwa to the northeast, Sindh to the east and southeast, the Arabian Sea to the south, Iran to the west and Afghanistan to the north and northwest.
The main ethnic groups in the province are the Baloch people and the Pashtuns, who constitute 52% and 36% of the population respectively (according to the preliminary 2011 census). The remaining 12% comprises smaller communities of Brahuis, Hazaras along with other communities such as Sindhis, Punjabis, Uzbeks and Turkmens. The name “Balochistan” means “the land of the Baloch”. Largely underdeveloped, its provincial economy is dominated by natural resources, especially its natural gas fields, estimated to have sufficient capacity to supply Pakistan’s demands over the medium to long term. Aside from Quetta, the second-largest city of the province is Turbat in the south, while another area of major economic importance is Gwadar Port on the Arabian Sea. Balochistan is noted for its unique culture and extremely dry desert climate.
The climate of the upper highlands is characterised by very cold winters and hot summers. In the lower highlands, winters vary from extremely cold in northern districts Ziarat, Quetta, Kalat, Muslim Baagh and Khanozai, where temperatures can drop to −20 °C (−4 °F), to milder conditions closer to the Makran coast. Winters are mild on the plains, with temperatures never falling below freezing point. Summers are hot and dry, especially in the arid zones of Chagai and Kharan districts. The plains are also very hot in summer, with temperatures reaching 50 °C (122 °F). The record highest temperature, 53 °C (127 °F), was recorded in Sibi on 26 May 2010, exceeding the previous record, 52 °C (126 °F). Other hot areas include Turbat and Dalbandin. The desert climate is characterised by hot and very arid conditions. Occasionally, strong windstorms make these areas very inhospitable.
Average annual precipitation in Balochistan varies from 2 to 20 inches (50 to 500 mm). Maximum precipitation falls in the northeastern areas with annual average rain fall ranging from 8 to 20 inches (200 to 500 mm). It decreases in the south and the eastern parts and is minimum in Naukundi. Kharan and Dalbandin area, rainfall ranges between 1 to 2 inches (25 to 50mm). Evaporation rates are higher than the precipitation and generally vary from 72 to 76 inches (1830 1930 mm) per annum.
RIVERS AND STREAMS
All rivers and streams are part of three major drainage systems. Coastal drainage system is characterized by small, ephemeral streams and hill torrents. Rivers and streams that do not possess any significant perennial flow constitute Inland system that dominates the central and northwestern area of the province. Nari, Kaha and Gaj rivers are part of Indus drainage system located in the northeastern margins of the province. The flow in rivers is typified by spring runoff and occasional flash floods. The rivers beds are dry and look like small streams. Stream gradients are high and the rate of run off is very rapid. The Zhob River Basin drains towards the northeast into the Gomal River which ultimately joins the Indus River. Streams along the border of Punjab and Sindh provinces flow toward the east and southeast into the Indus River. Central and western Balochistan drains towards the south and the southwest into the Arabian Sea. Some areas located in districts Chaghi, Kharan, and Panjgur drain into playa lakes, locally called ” Hamun” such as Humun-e-Lora and Hamun-e-Mashkel etc.
The important rivers in Balochistan are Zhob, Nari, Bolan, Pishin, Lora, Mula, Hub, Porali, Hingol, Rakshan and Dasht.