Abstract
In recent years, the security environment surrounding Japan has become severer, and there are symptoms of change in the geopolitical environment, such as security concerns with neighboring countries and the possibility of the reduction of the U.S. military presence in East Asia. On the other hand, insufficient development of logistics such as marine transportation, and the lack of rules for controlling transportation in emergency have been discussed. The development and control of transportation and traffic networks is one of the issues of national land planning, and it is thought that an integrated study of security planning and national land planning is necessary, but very little research and practice have been conducted. Sakai et al. (2021) pointed out that geopolitical perspectives were incorporated into national land planning in the pre-war period, and that the perspective has become unclear in the post-war period. On the other hand, this study examines the literature on geopolitical theories rather than national land planning to determine whether or not, and how much, geopolitical conditions have had an intrinsic influence on national land planning, especially transportation. In addition, based on geopolitical theories, this study propose that, national defense is desired to be planned and operated in conjunction with national land planning even presently, and what are the important strategic elements.
