Imagine flying east from the Atlantic coast of Morocco. Beneath you the golden Sahara rolls by, then the sunlit Nile threads through Egypt, the mountains of Iran rise, the mighty Indus waters Pakistan, and finally green islands scatter across a warm sea — you have crossed the Muslim world, and you have landed in Indonesia, the country with the largest Muslim population on Earth.
A broad sweep across the map
Muslim-majority countries stretch in a long band across the globe. It helps to picture them in five groups:
- North Africa — Morocco, Algeria, Egypt and their neighbours, edged by the vast Sahara.
- The Middle East — Saudi Arabia, Iraq, Iran, Turkey and the Gulf states.
- Central Asia — Kazakhstan, Uzbekistan and others, dry lands between mountains.
- South Asia — Pakistan and Bangladesh, watered by great rivers.
- Southeast Asia — Indonesia and Malaysia, tropical and green.
A common mix-up: Arab and Muslim are not the same thing. Most Muslims are not Arab — Indonesia, Pakistan, Bangladesh and India together are home to far more Muslims than the whole Arab world.
Deserts, rivers and mountains
Three great deserts dominate: the Sahara (North Africa, the world's largest hot desert), the Arabian Desert, and the Thar on the India–Pakistan border. Between them run rivers that turned dry lands green:
| River | Where | Why it matters |
|---|---|---|
| Nile | Egypt, Sudan | A ribbon of farmland through the Sahara |
| Tigris & Euphrates | Iraq | The ancient "land between rivers" |
| Indus | Pakistan | Feeds huge irrigated farms |
Tall mountains matter too — the Atlas in Morocco, the Zagros in Iran, and the towering Karakoram and Hindu Kush near Pakistan, whose snow-melt feeds the rivers.
Climate shapes daily life
Climate divides the region sharply. Much of North Africa and Arabia is hot desert: scorching days, cold nights and almost no rain, so farming depends on rivers, wells and oases. South and Southeast Asia, by contrast, are ruled by the monsoon — a seasonal wind that brings heavy summer rain, filling rivers and flooding the paddy fields where rice is grown. This is why Bangladesh and Indonesia are lush and crowded while central Arabia is nearly empty.