São Tomé is  long and  wide and the more mountainous of the two islands. Its peaks reach  – Pico de São Tomé. Príncipe is about  long and  wide. Its peaks reach  – Pico de Príncipe. Swift streams radiating down the mountains through lush forest and cropland to the sea cross both islands. The Equator lies immediately south of São Tomé Island, passing through the islet Ilhéu das Rolas.