AP® World History: Modern · Unit 2 · Topic 2.7
Silk Roads, Indian Ocean, and Sahara Compared
The Silk Roads, Indian Ocean routes, and trans-Saharan routes all moved goods across Afro-Eurasia between 1200 and 1450, but each relied on different transport and terrain, so each carried different cargo: overland routes carried light luxuries, sea routes carried bulk goods.
Three networks crisscrossed the same landmass in this period. The Silk Roads ran overland from East Asia through Central Asia to the Mediterranean, moving goods by camel and cart through deserts and mountain passes. The Indian Ocean network linked East Africa, Arabia, India, Southeast Asia, and China by ship, riding monsoon winds across open water. The trans-Saharan routes crossed the Sahara desert by camel caravan, connecting West African kingdoms like Mali to North Africa. Same continents, same centuries, very different cargo.
The difference comes down to cost per ton. Camels and carts can only carry so much weight, and every mile overland means paying for feed, water, tolls, and labor, plus the risk of raiders and harsh terrain. A ship carries vastly more cargo in a single hold and moves it for a fraction of the cost per ton, even over longer distances. That gap in cost is why overland routes carried silk, spices in small quantities, gems, and gold: goods valuable enough per pound to justify the expense. Sea routes could afford to carry pepper by the ton, along with grain, timber, and textiles in bulk, because the cost per unit stayed low even for heavy, everyday goods.
This cost logic connects directly to the Mongol conquests and the plague that follows in this unit. Mongol control of the Silk Roads lowered overland risk and tolls for a time, but the routes stayed built for light luxury goods. The same roads and sea lanes that carried silk and pepper also carried the Black Death, since trade networks move disease as efficiently as cargo.
Key terms
- Silk Roads
- Overland trade routes connecting East Asia to the Mediterranean, carrying light, high-value goods by camel and cart.
- Indian Ocean trade network
- A maritime trade system linking East Africa, Arabia, India, Southeast Asia, and China using monsoon winds.
- Trans-Saharan routes
- Camel caravan routes crossing the Sahara desert, linking West African kingdoms to North Africa.
- Cost per ton
- The price of moving one ton of cargo a given distance, which determines what goods are profitable to transport.
- Bulk goods
- Heavy, lower-value-per-pound cargo like grain or pepper that is only profitable to move cheaply, as by ship.
Watch it explained
- How it worksShow me the Silk Roads, the Indian Ocean and the trans-Saharan routes side by side on one map.
- How it worksHow does the cost of moving a ton of goods by camel, by cart and by ship compare?
- Worked exampleTrace the same amount of pepper going overland and going by sea and compare what arrives.
- Ties togetherHow does cheap sea freight explain why the Indian Ocean carried bulk goods and the Silk Roads carried luxuries?
Check yourself
End of topic.