Two Men Exploring Sulfur Dioxide Smoke At Kawah Ijen, Java, Indonesia

30 39 years active volcano adult adults only asia backpack caucasian ethnicity central java province color image day east java province emitting full length geology heat horizontal ijen indonesia java looking at view men mid adult mid adult men mine mineral mining nature non urban scene only men outdoors people physical geography protection rear view rock safety smoke social issues standing stratovolcano sulphur toxic substance travel destinations two people volcanic crater volcanic terrain volcano