What are the characteristics of the Sahara Sahel Savannah and the rain forest?

The Sahara Desert is characterized by extreme aridity, vast sand dunes, and sparse vegetation, predominantly consisting of hardy shrubs and occasional oases. The Sahel is a semi-arid transitional zone between the Sahara and the savannah, featuring grasslands and scattered trees, with seasonal rainfall that supports pastoralism and agriculture. The Savannah is characterized by open grasslands with scattered trees, supporting diverse wildlife and experiencing distinct wet and dry seasons. In contrast, rainforests are dense, biodiverse ecosystems with high humidity, abundant rainfall year-round, and a rich variety of flora and fauna.