A large area of the southern part of the Izu Peninsula, including Nishi-Izu and Minami-Izu, is made up of submarine volcanoes and volcanic islands that erupted before Izu collided with Honshu. Senganmon at the end of the promenade and Mt. Mt. Eboshi, which can be seen to the right of Senganmon, are part of the "volcanic root" (volcanic rock neck) where the "magma passage" that once existed under an undersea volcano appeared on the ground.
Senganmon has a tunnel (Kaishokudo) carved by waves in the center of the rock, and its appearance that looks like a huge gate is likened to the gate of Kumomi Sengen Jinja Shrine at the top of Mt. Mt. Eboshi, and it was called "Sengenmon", but it is called "Senganmon" because it means that "it is worth seeing is also worth Senganmon". It came to be called.
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