 The islands are mountainous, with the highest peaks reaching to 2,024 meters on São Tomé (Pico de São Tomé), 948 meters on Príncipe (Pico do Príncipe), and 598 meters on Annobón (Pico Quioveo).Príncipe is the oldest of the islands, with the oldest rocks dating back 31 million years.São Tomé is 14 million years old, and Annobón 4.8 million years old.