Routable GPS map for Garmin navigation devices. Sierra Leone is located in western Africa. Sierra Leone is bordered by the Atlantic Ocean, Guinea to the north and east, and Liberia to the south. Sierra Leone Bordering Countries are Guinea and Liberia. Things to see in Sierra Leone are the Atlantic Ocean, Great Scarcies River, Loma Mountains, Mano River, Moa River, Moro River, Rokel River, Sherbo Island, Sherbro River and Yawri Bay.