A metaphysical formation created by High Priest Tenkai as the foundation for his spell effecting eternal peace and security for the Tokugawa Shogunate. The Houjou planned to exploit it as a power-focus in their quest to conquer the country. The three points of the right triangle are: Mt. Nikkou (north), Sunosaki Shrine (south), and the Toushou Shrine at Mt. Kunou (west).
Great Kantou Triangle (関東大三角)