The map depicts the idea of passing through the Indochina Peninsula from the Indian Ocean to the Pacific Ocean by land. According to this diagram, cargo needs to be transshipped from Dawei to land. If a canal runs through the Indochina Peninsula, all nations/people can truly realize “Free and Open Indo-Pacific”.
Source: “Diplomacy that takes a panoramic perspective of the world map” made by the Ministry of Foreign Affairs of Japan, p.4
