The Sahara Desert is the largest desert in the world. If you took it out of Africa and put it down in the United States, it would stretch from California to New York. It's that big!
It's also hot. During the say, temperatures can reach 130 degree Fahrenheit. That's hot!
It's also dry. It almost never rains.
It's nickname is the Sea of Sand.
There are some little patches of land in the Sahara where green plants grow. A little patch like this is called an oasis. An oasis has an underground stream that provides fresh water and green plants. But you might travel days before you found an oasis.
The Sahara has many poisonous snakes and spiders.
You can see why people were not eager to cross the Sahara Desert, simply to see what was on the other side.