For freight transport waterways are of importance, e.g. the industrial zones of Manaus can be reached only by means of the Solimões–Amazonas waterway ( with minimum depth). The country also has of waterways. Coastal shipping links widely separated parts of the country. Bolivia and Paraguay have been given free ports at Santos. Of the 36 deep-water ports, Santos, Itajaí, Rio Grande, Paranaguá, Rio de Janeiro, Sepetiba, Vitória, Suape, Manaus and São Francisco do Sul are the most important. Bulk carriers have to wait up to 18 days before being serviced, container ships 36.3 hours on average.