Bight of Benin, Niger Delta, and São Tomé, Part 1: Rainforest Ecoregions São Tomé, Príncipe, and Annobon forests ecoregion On mountainous islands 180 miles offshore in the Gulf of Guinea are rainforests with little seasonal climate variation and high humidity all year. The rainforests show a high level of endemism, with 37 endemic plant species … More Bight of Benin, Niger Delta, and São Tomé, Part 1