 Liquid mud piled up over an area as wide as the city area of Mishima.In 864 (the 6th year of the "Jōgan" era) there was an eruption on the north-east side of Mount Fuji, which produced a great amount of lava.The latest eruption, in 1707 (the 4th year of the "Hōei" era), was known as the great "Hōei" eruption.