The opening of the Port of Alumar, Port of Itaqui and Port of Ponta da Madeira, currently the second deepest in the world, second only to the Rotterdam, is one of the busiest in the country. It serves as a gateway for industrial production and iron ore arriving from the Carajás Railway, operated by Companhia Vale do Rio Doce and also exports soybeans grown in southern Maranhão and central Brazil, transported by the Carajás Railway and North-South Railway. The port's proximity to strategic markets in Europe and North America has led it to become an attractive option for exporting goods, but suffers from increased coastal shipping.