Why does Gabon have a dense equatorial rainforest?

Gabon’s dense equatorial rainforest is primarily the result of the country’s equatorial climate, which is characterized by high temperatures and humidity that persist year-round.12

This climate supports lush vegetation, with rainfall levels that are significant, ranging from an annual average of 120 inches (3,050 mm) in Libreville to as much as 150 inches (3,810 mm) along the northwest coast. While there is a period between June and September with little to no rainfall, the high humidity levels remain constant, preventing the forest from drying out. Consequently, approximately three-fourths of Gabon is covered by this dense rainforest, which hosts more than 3,000 species of vegetation.234