Peninsula Mountains References Peninsula Mountains mountains, Sierra Leone Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: Sierra Leone/ ReliefThe Peninsula Mountains rise from the coastal swamps and reach some 2,900 feet (880 metres) at Picket Hill. Read MoreThe Peninsula Mountains rise from the coastal swamps and reach some 2,900 feet (880 metres) at Picket Hill. Read More