Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
District of São Tomé and Príncipe
District in São Tomé, São Tomé and Príncipe
The district includes the small islet of Rolas where the equator passes right though the islet's only settlement. Other than Ilhéu das Rolas, the district also includes other islets including Ilhéu Quixibá and Sete Pedras. Much of the district lies within Parque Natural Obô de São Tomé. The most notable natural landmark is the volcanic vent Pico Cão Grande.