Which four geographic regions make up Guinea?

The country of Guinea is composed of four distinct geographic regions:12

• Lower Guinea: This region encompasses the coast and the coastal plain, which features tidal estuaries and rias created by marine submergence.2
• Fouta Djallon: A mountainous region characterized by a series of sandstone plateaus, deep valleys, and igneous rock formations that serve as a major watershed for western Africa.32
• Upper Guinea: Composed of the Niger Plains, this area slopes northeast toward the Sahara and is marked by granite hills and an average elevation of about 1,000 feet.2
• Forest Region (Guinea Highlands): Located in the southeastern corner of the country, this area consists of hills and includes Mount Nimba, the highest point in Guinea.2