São Tomé and Príncipe (English: Saint Thomas and Prince), officially the Democratic Republic of São Tomé and Príncipe, is a Portuguese-speaking island country in the Gulf of Guinea, off the western equatorial coast of Central Africa. It consists of two archipelagos around the two main islands of São Tomé and Príncipe, about 150 km (93.21 mi) apart and about 250 and 225 km (155 and 140 mi) off the north-western coast of Gabon. With a population of 201,800 (2018 official estimate), São Tomé and Príncipe is the second-smallest and second-least populous African sovereign state after Seychelles.

"Great Dog Peak" is a landmark needle-shaped volcanic plug peak in São Tomé and Príncipe, in the Caué District of São Tomé Island in Parque Natural Obô de São Tomé. Its summit is 663 m (2,175 ft) above sea level, and it rises about 370 m (1,210 ft) over the surrounding terrain. The volcanic plug was formed by magma solidifying in the vent of an active volcano. The nearest village is Vila Clotilde, 3 km to the east. The district seat São João dos Angolares is 9 km to the east. The volcanic plug is quite a recent phenomenon, having formed as part of the Cameroon line of volcanoes roughly three and a half million years ago in the Pliocene. Its composition is mainly phonolite (also called clinkstone in vernacular English)