The Ijen Volcano complex is a group of composite volcanoes in the Banyuwangi Regency of East Java, Indonesia.
It is inside a larger caldera ijen, which is about 20 kilometres wide. The Mount Merapi stratovolcano is the highest point of that complex.The name “Merapi Mount “means “mountain of fire” in the Indonesian language (api being “fire”). Merapi Mount in Central Java and Marapi in Sumatra have the same etymology.
West of Merapi Mount is the Ijen volcano, which has a one-kilometre-wide turquoise-coloured acidic crater lake.The lake is the site of a labour intensive sulfur mining operation, in which sulfur-laden baskets are carried by hand from the crater floor.The work is paid well considering the cost of living in the area, but is very onerous.Workers earn around Rp 50,000 – 75,000 ($5.50 – $8.30)per day and once out of the crater, still need to carry their loads of sulfur chunks about three kilometers to the nearby Paltuding Valley to get paid.
Also in Ijen you can see phenomenon the name is Blue fire. Since National Geographic mentioned the electric-blue flame of Ijen, tourist numbers increased. The phenomenon has occurred for a long time.A two hour hike is required to reach the rim of the crater, folowed by a 45 minutes hike down to the bank of the crater.The blue fire is ignited sulphuric gas, which emerges from cracks at temperatures up to 600 degrees Celcius.
The flames can be up to 5 meters high, some of the gas condenses to liquid and is still ignited.It is the largest blue flame area in the world and local people refer to it as Blue Fire.