For today's Geo Quiz -- we're heading to Africa's westernmost region. The United Nations defines West Africa as a group of 16 countries.

They cover an area of approximately 2-million square miles.

We've got our eyes on one of those 16 countries. It's the one surrounded by Sierra Leone, Guinea, Ivory Coast and the Atlantic Ocean. Many of its residents live along the Pepper Coast -- so named because of a pungent pepper that grows in the region.

This country is also in the news today. Its president declared a state of emergency to combat an infestation of caterpillars. Like locust swarms, the hordes of caterpillars are eating crops and causing havoc.

More about that situation...