The mining sector represents 14% of the gross domestic product (GDP) of the state, originated mainly from the extraction of iron, bauxite, manganese, limestone and tin, as well as gold, until recently extracted from one of the largest mines of recent history: Serra Pelada. The economy of Pará is based also on the extraction of vegetation, on agriculture and cattle raising. Thanks to the rich soil and the important hydrographic basin – boats are the main means of transport in the region. Guaraná, a tree from which a powder is produced and used as a stimulant, and annatto seeds, a fruit used for cooking, as a sunscreen and for dye extraction. Marajó – the biggest fluvial-maritime island in the world, with an area of . Its territory has one of the largest mining areas in the country, in the Carajás Mountains, a mining province where the Ferro Carajás Project is based, from Companhia Vale do Rio Doce. The complex produced 296 million metric tons of iron ore in 2007, exporting the product to many countries, among them Japan, Germany, Italy, France and Spain.