Which of the following countries is not in the African continent ?

Costa Rica is not located on the African continent; it is a country in Central America, positioned in the Northern and Western hemispheres [t2]. It is bordered by Nicaragua to the north, Panama to the southeast, the Caribbean Sea to the northeast, and the Pacific Ocean to the southwest [t2][t4]. In contrast, the other options are all African nations. Togo and Sierra Leone are located in West Africa, with Sierra Leone specifically identified as an African country in regional availability lists [t8]. Mauritania, officially the Islamic Republic of Mauritania, is also situated in Africa [t3]. Ghana, which borders Togo, is a major African cocoa producer alongside Nigeria and Cameroon [c2]. While Costa Rica is also a significant cocoa producer, it belongs to the group of producers located in the Americas [c2].

Sources

1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 12: Major Crops and Cropping Patterns in India > Cocoa or Cacao (Teobroma Cacao) > p. 48