Sao Tome and Principe

The Democratic Republic of São Tomé and Príncipe is a tiny two-island nation in the Gulf of Guinea, distanced 140 kilometers from one another, and situated about 250 and 225 kilometers, respectively, off the northwestern coast of Gabon. Both islands are part of an extinct volcanic mountain range. São Tomé, the sizable southern island, is situated almost exactly on the equator. It is named after Saint Thomas Day, the day of its discovery by Portuguese explorers.

Source: Wikipedia.