Hell Valley (Jigokudani) is the biggest spring-source for Hokkaido’s Noboribetsu hot springs, and were designated a Hokkaido Treasure in 2004.
The area is defined by the remains of a crater that resulted from the eruption of Mt. Kasa about 10,000 years ago. Hell Valley  has many  vents from which hot water, vapor and volcanic gas erupt.  The hellish bad smell of  sulfur around the whole area gives the district its name. There are 15 places with names such as Pistol Hell or Lead Hell.  You can see them from three spots.
There are 15 different kinds of springs, which is very rare in one place. Hot water issues from he springs at an astonishing rate of 10,000 tons a day.
Many people, in all seasons, visit this resort and sightseeing place; and it is a very popular hot spring.