Tourists trekking, Sulphur Lake, Kawah Ijen, Ijen Plateau, island of Java, Indonesia, Southeast Asia, Asia

arid landscape asia asian color color image colour contemporary day daytime geology hiking horizontal ijen plateau indonesia indonesian java kawah ijen landscape landscapes mountain natural world nature outdoors outside people photography physical geography smoke smoking south east asia steam steaming stepping sulphur lake surface processes tourists travel travel destinations trek trekkers trekking volcanic volcanic landscape volcano volcanoes walkers walking peak step tramping walk