What geographical feature accounts for why Camel caravans were an important innovation in trade in West Africa?

Niger River

Atlas Mountains

Sahara Desert

Mediterranean Sea

The Camel caravan was an important innovation during the trade in Africa because it allows merchants to cross the Sahara Desert. Camels are the only animals that can withstand this trail. They are biologically fit to move in the desert with less water.

I believe the answer is: Saharan desert

In Hot Desert such as sahara, there is very few water source that organism can use to drink and replenish the fluid in their body, which is why not many animal can afford to cross the Saharan desert.

Camels is the only animal available that could store a Huge amount of water in their hump, which enable them to cross the desert for a very long time without needing to drink.