雲仙地獄でもっとも高い場所に位置するのが、この大叫換地獄です。噴気が激しく、白い噴煙をひときわ高く上げています。
　大叫換地獄とは、仏教の世界で「罪を犯した人が死んだ後に落ちる地獄」の1つとされています。
生前に、嘘をついた罪人が落ちるところとされ、地獄の鬼によって舌に針を刺されたり、抜かれたりするそうです。
　雲仙温泉の泉質は「硫酸・酸性の硫黄泉」で強い酸性になります。温泉の温度も高いところでは、100度近くになり、そういった性質もより一層、地獄の印象を強くさせています。
また、噴気孔の側では高温の水蒸気に含まれた硫黄が結晶化して、美しい黄色の結晶を見ることができる。

★ 英語バージョン
　The tallest Unzen jigoku also has the most intimidating name: Daikyokan Jigoku, or the Great Howling Hell.
Recall that Unzen was once a center of Buddhist spirituality, which influenced the names of locations in the region. This is another example. The story goes that the Great Howling Hell is one of 16 realms sinners are sent to, where liars are tortured by demons. It does not take much imagination to understand why Daikyokan Jidoku earned its name: the sound of hot gas escaping from volcanic vents can sound like wailing from the underworld, especially at night.
　Daikyokan Jidoku is the most active of Unzen’s jigoku. The water here is particularly hot and acidic, but this was not always the case. The liveliest spot of activity has been slowly moving from west to east. The Kyūhachiman Jigoku has stopped emitting gas altogether, and the Gensei Marsh, a former jigoku, has turned into a beautiful marshland. It is likely that over time the Great Howling Hell will become more peaceful as well.