The road running north along the west coast of Oga Peninsula from Monzen District was opened by the Japan Self-Defense Forces in 1970 as Daisankyo Toll Road (it is now no longer a toll road and is part of Prefectural Highway 59). Before that, ships were the primary form of transport. The cliff face on the western side meets the Sea of Japan, creating a magnificent view. It is thought that about 30 million years ago, when the Japanese islands were part of the eastern edge of the Eurasian continent, a volcanic eruption caused mudslides resulting in this cliff, which has since been weathered into various shapes.
