Geography

Earth is a rocky planet ~12,742 km in diameter, tilted 23.5°, orbiting the sun at ~150 million km. The tilt gives us seasons. The moon (a quarter earth's size) stabilises our axis and gives us tides.

The surface is ~71% water and 29% land. The land is divided into seven continents (Asia, Africa, North America, South America, Antarctica, Europe, Australia) sitting on tectonic plates that drift a few centimetres each year — enough to open oceans and raise mountains over millions of years.

The Himalayas are still rising as India collides with Asia; the Atlantic is still widening; the Pacific 'Ring of Fire' is where plates dive under one another, producing volcanoes and earthquakes.

Climate is the average weather of a place over decades. The Köppen classification groups climates into tropical, dry, temperate, continental, and polar — with sub-types. Cairo is arid; London is temperate oceanic; Jakarta is tropical rainforest.

Each climate hosts a biome: tundra, taiga, temperate forest, grassland, desert, tropical rainforest, savanna. Ecosystems within them balance a thin web of plants, animals, water, and soil.

Human-caused climate change — the release of CO₂ from fossil fuels since the 1800s — is now warming the planet by ~0.2°C per decade, shifting rainfall, raising seas, and intensifying storms.

There are 195 countries today, home to ~8 billion people. The most populous: India (~1.43 bn), China (~1.41 bn), USA (~340 m), Indonesia (~280 m), Pakistan (~240 m), Nigeria (~225 m).

About 25% of humanity is Muslim — roughly 2 billion — with the largest Muslim populations in Indonesia, Pakistan, India, Bangladesh, Nigeria, and Egypt.

More than half of humans now live in cities. The world's largest urban regions include Tokyo, Delhi, Shanghai, São Paulo, Mexico City, Cairo, and Mumbai.

The 'Muslim world' spans from Morocco to Indonesia — a continuous belt broken only by the Mediterranean. Historically it hugs the trade routes: the Sahara caravans, the Silk Road, the monsoon-driven Indian Ocean routes that connected Zanzibar to Malacca.

The most sacred geography sits in western Arabia: Mecca (birthplace of the Prophet ﷺ and the Ka'ba), Medina (the first Muslim city), and Jerusalem (Al-Aqsa, the third holy site) — three cities whose coordinates every Muslim child eventually learns.

Water covers 71% of the earth but only 2.5% is fresh, and most of that is locked in ice caps. The remaining fraction — rivers, lakes, groundwater, atmosphere — supports all terrestrial life.

The great rivers built civilisation: the Nile (Egypt), the Tigris and Euphrates (Mesopotamia), the Indus (Harappa, later Sindh), the Ganges (India), the Yangtze and Yellow (China), the Amazon (South America), the Volga (Russia). Every major Muslim historic city sits on or near water: Baghdad on the Tigris, Cairo on the Nile, Damascus on the Barada, Cordoba on the Guadalquivir, Istanbul on the Bosphorus.

Oceans regulate climate. The Gulf Stream keeps western Europe temperate; El Niño events shift Pacific rainfall and can drought East Africa. Monsoons — driven by the annual heating of the Asian landmass — deliver the rains on which nearly two billion South and Southeast Asians depend.

Where things are matters. Coal fired the Industrial Revolution and shaped 19th-century Britain and Germany. Oil defined the 20th century: the Muslim-majority states of the Persian Gulf sit atop roughly half of the world's proven reserves, which is why the region is both wealthier and more contested than its size would suggest.

Rare-earth metals and lithium now shape 21st-century geopolitics — batteries, phones, and electric cars all need them. The Democratic Republic of Congo alone holds ~70% of the world's cobalt.

Water is becoming a strategic resource. Egypt, Sudan, and Ethiopia are locked in a slow-burning dispute over the waters of the Nile; Turkey, Syria, and Iraq over the Tigris–Euphrates.

The 'Muslim world' spans from Morocco to Indonesia — a continuous belt broken only by the Mediterranean. Historically it hugs the trade routes: the Sahara caravans, the Silk Road, the monsoon-driven Indian Ocean routes that connected Zanzibar to Malacca.

Some anchor cities to know: Mecca (Saudi Arabia — the qibla of every prayer); Medina (Saudi Arabia — the Prophet's city); Jerusalem (Palestine — al-Aqsa, the third holy site); Cairo (Egypt — al-Azhar, oldest university still teaching); Damascus (Syria — capital of the Umayyads); Baghdad (Iraq — Abbasid golden age); Istanbul (Turkey — Ottoman capital, straddling Europe and Asia); Cordoba (Spain — the jewel of al-Andalus); Fez (Morocco — Qarawiyyin, the world's oldest university); Timbuktu (Mali — great manuscript city of West Africa); Samarkand (Uzbekistan — Timurid capital); Delhi (India — long the seat of Muslim rule in South Asia); Jakarta (Indonesia — capital of the world's largest Muslim country).

The most populous Muslim countries: Indonesia (~245 m Muslims), Pakistan (~240 m), India (~210 m), Bangladesh (~155 m), Nigeria (~110 m), Egypt (~100 m), Iran (~85 m), Turkey (~85 m).