Geography

Pakistan covers 803,940 square kilometres (310,403 square miles), approximately the combined land areas of France and the United Kingdom, with its eastern regions located on the Indian tectonic plate and the western and northern regions on the Iranian plateau and Eurasian landplate. Apart from the 1,046 kilometre (650 mi) Arabian Sea coastline, Pakistan's land borders total 6,774 kilometres: 2,430 kilometres (1,509 mi) with Afghanistan to the northwest, 523 kilometres (325 mi) with China to the northeast, 2,912 kilometres (1,809 mi) with India to the east and 909 kilometres (565 mi) with Iran to the southwest.

Pakistan geologically overlaps both with the Indian and the Eurasian landplates. The provinces of Sindh and Punjab are found in the northwestern corner of the Indian tectonic plate; Balochistan and most of the North West Frontier Province exist on the Eurasian Plate tectonic plate; the Iranian plateau is part of both the Middle East and Central Asia. The Northern Areas and Azad Kashmir also lie mainly in Central Asia along the edge of the Indian plate and as a result are prone to severe earthquakes where Eurasian and the Indian plates collide.

The different types of natural features range from the sandy beaches, lagoons and mangrove swamps of the southern coast to preserved beautiful moist temperate forests and the icy peaks of the Himalaya, Karakoram and Hindu Kush mountains in the north. There are an estimated 108 peaks above 7,000 metres (23,000 ft) high that are covered in snow and glaciers. Five of the mountains in Pakistan (including K2 and Nanga Parbat) are over 8,000 metres (26,000 ft). To the west of the Indus River are the dry, hilly deserts of Balochistan; to the east are the rolling sand dunes of the Thar Desert. The Tharparkar desert in the southern province of Sindh, is the only fertile desert in the world. Most areas of Punjab and parts of Sindh are fertile plains where agriculture is of great importance.

Pakistan's western borders include the Khyber Pass and Bolan Pass, traditional invasion routes between Central Asia and the South Asia.

Geographical Regions

Pakistan is divided into three major geographic areas: the northern highlands; the Indus River plain, with two major subdivisions corresponding roughly to the provinces of Punjab and Sindh; and the Balochistan Plateau. Some geographers designate additional major regions. For example, the mountain ranges along the western border with Afghanistan are sometimes described separately from the Balochistan Plateau, and on the eastern border with India, south of the Sutlej River, the Thar Desert may be considered separately from the Indus Plain. Nevertheless, the country may conveniently be visualized in general terms as divided in three by an imaginary line drawn eastward from the Khyber Pass and another drawn southwest from Islamabad down the middle of the country. Roughly, then, the northern highlands are north of the imaginary east-west line; the Balochistan Plateau is to the west of the imaginary southwest line; and the Indus Plain lies to the east of that line.

Mountains

The northern highlands include parts of the Hindu Kush, the Karakoram Range and the Himalayas. This area includes such famous peaks as K2 (Mount Godwin Austen, at 8,611 metres the second highest peak in the world), and Nanga Parbat (8,126 metres), the twelfth highest. More than one-half of the summits are over 4,500 metres, and more than fifty peaks reach above 6,500 metres. Travel through the area is difficult and dangerous, although the government is attempting to develop certain areas into tourist and trekking sites. Because of their rugged topography and the rigors of the climate, the northern highlands and the Himalayas to the east have been formidable barriers to movement into Pakistan throughout history.

South of the northern highlands and west of the Indus River plain are the Safed Koh Range along the Afghanistan border and the Sulaiman Range and Kirthar Range, which define the western extent of the province of Sindh and reach almost to the southern coast. The lower reaches are far more arid than those in the north, and they branch into ranges that run generally to the southwest across the province Balochistan. North-south valleys in Balochistan and Sindh have restricted the migration of peoples along the Makran Coast on the Arabian Sea east toward the plains.

Several large passes cut the ranges along the border with Afghanistan. Among them are the Khojak Pass, about eighty kilometres northwest of Quetta in Balochistan; the Khyber Pass, forty kilometres west of Peshawar and leading to Kabul; and the Baroghil Pass in the far north, providing access to the Wakhan Corridor.

Rivers and Drainage

The name Indus comes from the Sanskrit word sindhu, meaning ocean, from which also come the words Sindh, Hindu, and India. The Indus, one of the great rivers of the world, rises in southwestern Tibet only about 160 kilometres west of the source of the Sutlej River, which joins the Indus in Punjab, and the Brahmaputra, which runs eastward before turning southwest and flowing through Bangladesh. The catchment area of the Indus is estimated at almost 1 million square kilometres, and all of Pakistan's major rivers--the Kabul, Jhelum, Chenab, Ravi, and Sutlej--flow into it. The Indus River basin is a large, fertile alluvial plain formed by silt from the Indus. This area has been inhabited by agricultural civilisations for at least 5,000 years.

The upper Indus Basin includes Punjab; the lower Indus Basin begins at the Panjnad River (the confluence of the eastern tributaries of the Indus) and extends south to the coast. In Punjab (meaning the "land of five waters") are the Indus, Jhelum, Chenab, Ravi, and Sutlej rivers. The Sutlej, however, is mostly on the Indian side of the border. In the southern part of the province of Punjab, the British attempted to harness the irrigation power of the water over 100 years ago when they established what came to be known as the Canal Colonies. The irrigation project, which facilitated the emergence of intensive cultivation despite arid conditions, resulted in important social and political transformations.

Pakistan has two great river dams: the Tarbela Dam on the Indus, near the early Buddhist site at Taxila, and the Mangla Dam on the Jhelum, where Punjab borders Azad Kashmir built as part of the Indus Basin Project. The Warsak Dam on the Kabul River near Peshawar is smaller. These dams, along with a series of headworks and barrages built by the British and expanded since independence, are of vital importance to the national economy and played an important role in calming the raging floodwaters of 1992, which devastated large areas in the northern highlands and the Punjab plains.

Seismic Activity

Pakistan is subject to frequent seismic disturbances because the tectonic plate under the Indian plate hits the plate under Eurasia as it continues to move northward and to push the Himalayas ever higher. The region surrounding Quetta is highly prone to earthquakes. A severe quake in 1931 was followed by one of more destructive force in 1935. The small city of Quetta was almost completely destroyed, and the adjacent military cantonment was heavily damaged. At least 20,000 people were killed. Tremors continue in the vicinity of Quetta; the most recent major quake occurred in January 1991. Far fewer people were killed in the 1991 quake than died in 1935, although entire villages in the North-West Frontier Province were destroyed. A major earthquake centered in the North-West Frontier Province's Kohistan District in 1965 also caused heavy damage.

Cultivation

Less than a one-fifth of Pakistan's land area has the potential for intensive agricultural use. Nearly all of the arable land is actively cultivated, but outputs are low by world standards. Cultivation is sparse in the northern mountains, the southern deserts, and the western plateaus, but the Indus River basin in Punjab and northern Sindh has fertile soil that enables Pakistan to feed its population under usual climatic conditions.

Environmental Issues

Of special concern to environmentalists is the diminishing forest cover in watershed regions of the northern highlands, which has only recently come under close scrutiny. Forest areas have been thoughtlessly denuded. Deforestation, which occurred at an annual rate of 0.4 percent in 1989-90, has contributed directly to the severity of the flooding problem faced by the nation in the early 1990s.

As industry has expanded, factories have emitted more and more toxic effluents into the air and water. The number of textile and food processing mills in rural Punjab has grown greatly since the mid-1970s, resulting in pollution of its rivers and irrigation canals. Groundwater quality throughout the country has also suffered from rapidly increasing use of pesticides and fertilizers aimed at promoting more intensive cropping and facilitating self-sufficiency in food production.

The National Conservation Strategy Report has documented how solid and liquid excreta are the major source of water pollution in the country and the cause of widespread waterborne diseases. Because only just over half of urban residents have access to sanitation, the remaining urban excreta are deposited on roadsides, into waterways, or incorporated into solid waste. Additionally, only three major sewage treatment plants exist in the country; two of them operate intermittently. Much of the untreated sewage goes into irrigation systems, where the wastewater is reused, and into streams and rivers, which become sewage carriers at low-flow periods. Consequently, the vegetables grown from such wastewater have serious bacteriological contamination. Gastroenteritis, widely considered in medical circles to be the leading cause of death in Pakistan, is transmitted through waterborne pollutants.

Low-lying land is generally used for solid waste disposal, without the benefit of sanitary landfill methods. The National Conservation Strategy has raised concerns about industrial toxic wastes also being dumped in municipal disposal areas without any record of their location, quantity or toxic composition. Another important issue is the contamination of shallow groundwater near urban industries that discharge wastes directly into the ground.

Water in Karachi is so contaminated that almost all residents boil it before consuming it. Because sewerage and water lines have been laid side by side in most parts of the city, leakage is the main cause of contamination. High levels of lead also have been found in water in Islamabad and Rawalpindi.

Air pollution has also become a major problem in most cities. There are no controls on vehicular emissions, which account for 90 percent of pollutants. The National Conservation Strategy Report claims that the average Pakistani vehicle emits twenty-five times as much carbon monoxide, twenty times as many hydrocarbons, and more than three and one-half times as much nitrous oxide in grams per kilometre as the average vehicle in the United States.

Another major source of pollution is noise. The hyperurbanization experienced by Pakistan since the 1960s has resulted in loose controls for heavy equipment operation in densely populated areas, as well as in crowded streets filled with buses, trucks, automobiles, and motorcycles, which often honk at each other and at the horse-drawn tongas (used for transporting people) and the horse-drawn rehras (used for transporting goods).