The Kitaizu Area consists of Mishima and Numazu Geosites, and the Nagaizumi and Shimizu Town localities which were added to the geopark in 2013.
The main features of this area are: lava flow of Mt. Fuji and Springwater. In fact these two are closely related geologically. This relationship is clearly understandable when you visit the Mishima Geosite. Mishima sits on the edge of a porous layer of lava that flowed from Mt. Fuji about 10,000 years ago and a layer that channels a great amount of meltwater from the mountain to Mishima. The lava layer is popularly known as ‘Mishima Lava.’ Numerous fissures and cracks in this lava layer allows this water to come to the surface as ‘springs’ which dot the Mishima landscape.
Kakitagawa River in Shimizu Town is the largest collection of such ‘springs’, a 1.2 km stetch of the ‘river’ is the result of countless streams issuing from the cracks in the lava. The Kakitagawa River is the shortest Class 1 River in Japan.
Due to the sensitive nature of these systems and the ecosystems they support, numerous ecological restoration works led by NPOs, town offices and ministry organs have taken place in this area.
The area also has a large port (Numazu) and sites related to ancient submarine volcaism (Shizuura, Uchiura).