A visit to Ijen Crater is a highlight of the tour, known for its bright blue sulfur lakes and the mesmerizing phenomenon of blue flames. The trek to Ijen takes place at night through the rugged terrain, ultimately leading to the crater rim where the breathtaking sights await. As dawn breaks, the daylight reveals the surreal turquoise lake, surrounded by steep cliffs and swirling smoke. Ijen is also famous for its sulfur miners, who brave harsh conditions to harvest sulfur from the crater, providing a unique insight into their traditional methods of extraction.