with coastal plain in southwest , dissected plateau in center , mountains in west , plains in north Natural resources : petroleum , bauxite , iron ore , timber , hydropower potentialLand use : arable land : 13 % permanent crops : 2 % meadows and pastures : 18 % forest and woodland : 54 % other : 13 % Irrigated land : 280 sq km ( 1989 est . ) Environment : current issues : water - borne diseases are prevalent ; deforestation ; overgrazing ; desertification ; poaching ; overfishing natural hazards : recent volcanic activity with release