Mexico has 76 seaports and 10 river ports.[18] The four major seaports concentrating around 60% of the merchandise traffic are Altamira and Veracruz in the Gulf of Mexico, and Manzanillo and Lázaro Cárdenas in the Pacific Ocean. These four seaports are followed in traffic by Acapulco, Puerto Vallarta, Guaymas, Tampico, Topolobambo, Mazatlán and Tuxpan