ijen volcano crater in java

acid active adventure aggressive asia attraction basket caldera cataclysm cliff climbing clouds cone crater danger dirty earthquake east ecology environment erupting eruption exotic exploration field fog foggy format fracture fume fumes fumy gas heat hiking hole horizontal ijen indonesia island java journey lake landscape largest lava mine mineral mist mount mountain mountains mud mystic nature park peak people person plateau power rock scenery scenic seismic semeru sky smoke steam stone sulfur tengger tourism travel trek valley view volcanic volcano water