Port of Tokyo Tokyo, Japan’s largest city and main business centre, is located at the northwest end of Tokyo Bay. Although half of the country’s export-import business is handled by companies in Tokyo, it is not the country’s leading port, because its harbour is relatively shallow and cannot accommodate larger ships. Yokohama’s harbour, just south of Tokyo on the same bay, is deeper and handles most of Japan’s ocean trade. Large quantities of freight move between the two cities on barges, trucks, and trains.