Topographic map of Tokyo metropolitan area. The blue area is where the ground level is lower than the water level of Tokyo Bay. The high altitude areas where the left and right are the Musashino Plateau and the Shimosa Plateau. The author creates this topographic map with the permission of the Geographical Survey Institute of Japan.
<a href="//commons.wikimedia.org/w/index.php?title=User:1500%E5%B9%B4%E5%89%8D%E3%81%AE%E5%8F%A4%E5%A2%B3&amp;action=edit&amp;redlink=1" class="new" title="User:1500年前の古墳 (page does not exist)">1500年前の古墳</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>