<human>:  Who discovered the Sahara desert?
<bot>: The Sahara desert is the largest hot desert in the world. It is located in Northern Africa. It is approximately the size of the United States. The Sahara desert is mostly a dry desert, but there are small areas of green vegetation in the south. The Sahara desert was discovered by the French explorer, Jean-François de Galaup de La Pérouse in 1786.