Connected to the sea of Japan Echigo Plain, the main peak of the mountain which is commonly referred to as Yahiko Mountains. (482m), continues to the north to the south (313m) Kugamiyama Kakudayama. Yahikoyama itself, is a bi-peak and ear (634m) Tahosan located in the north. Has been designated as National Park along with the mountains of Sado Yahiko-Yoneyama series.
As a mountain that can be seen from the large areas of Niigata Prefecture, was dedicated to the deity of Yahiko Shrine, collect the adoration of the people through the ages, the whole mountain has become a sanctuary of Yahiko Shrine. Japan Mitsuhiko mountain called Hikosan, along with the Setsupikosan.
As mentioned we have a San'yo was suddenly protruded from the shore, "absolute altitude is not enough to mountains but must" and also in the afterword of his book Japan Hyaku-mei mountain Hisaya Fukada Kano, in spite of the altitude I have a very graceful San'yo. Volcanic rocks of various andesite, basalt, and rhyolite are distributed, in geology, but also found pillow lava to the coast, or a scheme of another or whether such things submarine volcano has been raised, research is almost it is at present not.