Gabon is easily divided into three distinct regions: a narrow coastal plain, a hilly mountainous interior, and a savanna in the far-east and south. Of note, rainforests cover nearly 85% of the country.
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.
Significant mountains include the Cristal Mountains in the northeast and the central Chaillu Massif (a large mountain mass).
The country also has hundreds of caves located in the dolomite and limestone rocks formations in the east central areas.
Gabon is drained by numerous rivers; the largest is the Ogooué which is 746 miles, (1,200 km) long.
The highest point of the country is Mont Iboundji at 2,534 ft. (1,575 m), and the lowest point is the Atlantic Ocean (0 m).