wooden footbridge in kawah ijen crater. the ijen volcano complex is a group of stratovolcanoes in the banyuwangi regency

indonesia crater java smoke gas sulphur sulfuric sulfur acid dangerous danger lake ijen volcano flame miner blue east worker exploration toxic mountain kawah labor mount asia heat erupting mineral fog landscape nature travel people steam adventure labour scenic rock vacano landmark mining mist fumes toxicity volcanic trekking brimstone yellow sulfuricacid