Ijen Crater & Blue Fire TrekIjen Crater & Blue Fire Trek

Climb under moonlight to the edge of Ijen’s smouldering volcano, where blue flames — caused by ignited sulphuric gas — flicker eerily in the dark. As the sun rises, the crater reveals a surreal turquoise lake framed by mist and minerals. This once-in-a-lifetime trek blends science, adventure, and wonder into a breathtaking display of nature’s most rare phenomena.