There are three distinct regions : the coastal plains ( ranging between 20 to 300 km from the ocean 's shore ) , the mountains ( the Cristal Mountains to the northeast of Libreville , the Chaillu Massif in the centre ) , and the savanna in the east .
There are three distinct regions : the coastal plains ( ranging between 20 to 300 km from the ocean 's shore ) , the mountains ( the Cristal Mountains to the northeast of Libreville , the Chaillu Massif in the centre , culminating at 1575 m with Mont Iboundji ) , and the savanna in the east .