Gabon is on the Atlantic coast of central Africa. It is on the equator. Gabon generally has an equatorial climate. Rainforests cover 85% of the country. There are three distinct regions: the coastal plains (ranging between 20 and 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. The coastal plains form a large section of the World Wildlife Fund's Atlantic Equatorial coastal forests ecoregion and contain patches of Central African mangroves especially on the Muni River estuary on the border with Equatorial Guinea.