Nasu volcano at the northern end of Kanto Plain in central Honshu is a group of 3 larger and older and 3 smaller, young stratovolcanoes. The younger cones are called Asahi-dake, Futamata-yama, and Chausu-dake, the youngest of the volcanoes. Chausu-dake started to grow about 16,000 years ago and has had many small phreatic eruptions in the past centuries.