Study guide: Physical Geography of Pakistan

📋 Course Outline

1. Desert Relief and Livelihoods
2. Indus Delta Environment and Economy
3. Piedmont Plains and Alluvial Fans
4. Indus Delta Relief and Fisheries
5. Indus Plain Landforms and Farming
6. Upper and Lower Indus Plain
7. Potwar Plateau and Salt Range
8. Potwar and Salt Range Economy and Drainage

📖 1. Desert Relief and Livelihoods

🔑 Key Concepts & Definitions

• Oasis: A fertile area in an arid desert where underground water reaches the surface naturally or is extracted through wells.

★ Must-know

• Pakistan's desert regions include the Thal Desert in Sindh Sagar Doab, the southeastern Thar Desert (including Nara, Cholistan and Tharparkar), and the Kharan Desert.

• Desert relief consists of sandy plains or undulating sandy areas, bare and weathered rocks, and mainly north–south longitudinal rolling sand dunes, with winds continually changing the landscape.

📌 Agriculture is generally unsupported by desert relief and climate, but it is possible on reclaimed land in areas called Tippas after canal irrigation is provided.

Further detail

• Desert livelihoods include cattle raising, cottage industries, and nomadic or semi-nomadic lifestyles; inadequate water limits agriculture, although canal irrigation has recently reclaimed more land.

• Pakistan's desert regions contain large mineral deposits, including coal, and work on coal exploitation has begun, while roads and electricity supply remain inadequate.

📖 2. Indus Delta Environment and Economy

★ Must-know

• The Indus Delta has low population density because swampy mud flats are covered by seawater, making the soil saline and limiting agriculture.

Further detail

• The Indus Delta receives about 250 mm of rainfall annually.

• Inadequate transport and other infrastructure, limited standard schools and hospitals, few industries and job opportunities, mangrove-covered areas, and occasional damaging cyclonic storms contribute to the Indus Delta's low population density.

💡 Memory Hook

Seawater salinity and swampy mud flats → limited farming and low population density

📖 3. Piedmont Plains and Alluvial Fans

🔑 Key Concepts & Definitions

• Piedmont plain: A foothill plain, found at the foot of the Sulaiman-Kirthar and Himalayan mountains, whose dominant landforms are alluvial fans or cones.

★ Must-know

• 🔄 Alluvial fans form as:
  1. Temporary rivers or streams form after rainfall.
  2. They reach the foothills and split into narrow channels.
  3. Water deposits sand, silt and gravel in fan- or cone-shaped forms.

Further detail

• The alluvial-soil plains formed by piedmont fans and cones are used for agriculture.

💡 Memory Hook

Rain-fed streams spread like a fan at the foothills, laying down alluvium

📖 4. Indus Delta Relief and Fisheries

★ Must-know

• The Indus Delta lies south of Thatta and extends to the Arabian Sea.

• In the Indus Delta, the Indus divides into numerous narrow, shallow tributaries and distributaries that cross a flat region and flow into the Arabian Sea.

• Indus water brings nutrients that provide fish food, and mangroves provide fish and shrimp breeding and spawning grounds.

Further detail

• Continual silt deposition makes Indus Delta channels shallow and raises their banks above adjacent areas, leaving alluvial tracts between channels.

• Mangrove roots trap nutrients brought by the Indus and shelter small fish from predators.

💡 Memory Hook

Mangrove roots trap Indus nutrients → fish food and shelter

📖 5. Indus Plain Landforms and Farming

🔑 Key Concepts & Definitions

• Doab: A doab is land located between two adjacent rivers; the Indus Plain doabs are Sindh Sagar between the Indus and Jhelum, Chaj between the Jhelum and Chenab, Rechna between the Chenab and Ravi, and Bari between the Ravi and Sutlej.
• Alluvial terraces: Higher areas between rivers in the upper Indus Plain, formed as uplands that are suitable for agriculture and safe from floods.

★ Must-know

• The Indus Plain is Pakistan's most productive region, and its relief and drainage encourage human settlement.

📌 Active flood plains are narrow strips immediately beside rivers, locally called bet or khaddar, and flood every rainy season; in the lower Indus Plain they can reach 40 km in width.

📌 Old flood plains lie between active flood plains and alluvial terraces, are normally flooded only after heavy monsoon rainfall about every 7 or 8 years, and bear old alluvium, abandoned channels, meander scars and oxbow remains.

• Old and active flood plains and doabs are farming areas, the Indus Plain has extensive canal irrigation, and cotton, rice and sugarcane are grown in summer while wheat is grown in winter.

Further detail

• Active flood plain features include:

  • Braided channels rich in alluvium
  • Meanders
  • Oxbow lakes formed from cut-off river loops
  • Levees raised by river deposition

• The bars of the Indus Plain are Kirana in Chaj Doab, Sandal in Rechna Doab, and Nili and Ganji in Bari Doab.

• The Indus Plain has relatively accessible road, rail and air transport, electricity and natural gas in most areas, industries, and a large, dense population that supplies markets and labor.

💡 Memory Hook

Active flood plains flood yearly; old flood plains usually flood only after heavy monsoon rain

📖 6. Upper and Lower Indus Plain

★ Must-know

• The Indus Plain is drained by the Indus and its eastern tributaries; the five tributaries Beas, Sutlej, Ravi, Chenab and Jhelum join to form the Punjinad, which meets the Indus near Mithan Kot before the Indus flows alone to the Arabian Sea.

• The Upper Indus Plain lies above Mithan Kot and the Lower Indus Plain lies below it.

• The Upper Indus Plain is in the north, has the Indus and its major tributaries, is nearly flat and undulating with a southwestward slope, and has an Indus width of 1.4–1.6 km.

• The Lower Indus Plain is in the south, is nearly flat and undulating with a southward slope, is drained only by the Indus, and has an Indus width of 1.6 km.

Further detail

📌 Both erosion and deposition occur in the Upper Indus Plain, which has meanders, oxbow lakes, braided channels and levees, fertile soil and canal irrigation, but no cuestas.

📌 Deposition is the main river process in the Lower Indus Plain, which has meanders, oxbow lakes, braided channels and levees, is suitable for agriculture, has cuestas and lacks alluvial terraces.

💡 Memory Hook

Upper: tributaries and erosion plus deposition; lower: Indus alone and deposition

📖 7. Potwar Plateau and Salt Range

★ Must-know

• The Potwar Plateau lies between the Indus and Jhelum rivers and has an average elevation of 300–600 m.

• Running water has dissected and eroded much of the Potwar Plateau into ridges, ravines, gullies and troughs, creating badland topography.

• The Salt Range covers areas around Jhelum, Chakwal, Kalabagh and Mianwali, consists of parallel ranges averaging 750–900 m in elevation, and reaches 1,527 m at Sakesar, its highest peak.

Further detail

• Potwar's residual hills, including Kala Chitta and Kher-i-Murat, formed from resistant rocks.

• Cultivation and irrigation are difficult on much of Potwar because land is limited and terrain is rugged, but agriculture is possible on the flatter, more extensive land in central Potwar.

• The Salt Range is badly faulted and eroded and is rich in rock salt, gypsum and limestone.

📖 8. Potwar and Salt Range Economy and Drainage

★ Must-know

• Potwar and the Salt Range contain non-metallic minerals including limestone, marble and rock salt, used as raw materials in cement, chemical and ceramic industries.

📌 Potwar farming depends on rainfall and is therefore called Barani or rain-fed agriculture, practiced mostly in central Potwar; the rugged landscape makes canal irrigation difficult.

• The Indus flows west of Potwar and the Salt Range, the Jhelum flows east of them, and the Soan drains most of the central area while the southeastern region drains into the Jhelum.

Further detail

• The Potwar region has gas and oil fields, and Attock Oil Refinery was established to refine oil from its oil fields.

• Crops grown in the Potwar region are:

  • Wheat
  • Maize
  • Barley
  • Gram

• Potwar has better roads and bridges than the Balochistan Plateau and is accessible by road, air and rail.

• Important employment-providing towns include:

  • Islamabad
  • Pindi
  • Chakwal
  • Jhelum

• Small streams drain into the main rivers of Potwar and the Salt Range, and lakes include Kalar Kahar and Khabeki.

📊 Synthesis Tables

Upper and Lower Indus Plain

Feature	Upper plain	Lower plain
Location	North; above Mithan Kot	South; below Mithan Kot
Rivers	Indus and major tributaries	Indus only
Slope	Southwest	South
River process	Erosion and deposition	Deposition dominant
Distinct forms	No cuestas	Cuestas; no alluvial terraces