Datangmarsh is the source of sulphur springs, the relics left after volcanic eruption, beautiful scenery, smelly sulphur taste, Tangmarsh and Hell Valley are very close, it is more convenient to visit together, never regret coming. I have never seen this scene. Every mountain here will steam, steaming has become a landscape here. At the beginning of April, the snow hasn't melted, the road is not easy to walk, it's very slippery and wet. Pay attention to wearing anti-slippery and anti-wet shoes. You can also stick a towel, because there is a free hot spring soaking feet here.