To be honest, it's really great. I didn't expect Hell Valley to be so beautiful before I came to Japan. The sulfur smell in the air is so stinky. In terms of length, for tourists who like photography, it is very suitable for shooting delay, it will take a little more time, about 1.5-2h. For tourists who are just looking at the scenery and taking some punch-in photos, they can go back and forth in about 1 hour. Unfortunately, I can't get up on the big soup marsh in winter, and I want to try again when the summer comes.