Kawah Ijen

Ijen Crater is a nature reserve Ijen Park is located between Banyuwangi and Bondowoso District, East Java, Indonesia. This crater exactly located at the top of Mount Ijen which is one of a series of volcanoes in East Java such as Bromo, Semeru and Merapi. Another uniqueness of this crater has a level of acidity is very high with almost close to zero and the temperature of the crater is 200° Celsius. In addition to altitude is located at 2,600 meters (8,660ft) above sea level. Posis crater is located in the middle of the largest caldera on the island of Java. The caldera size about 20 miles. The crater size is about 960 meters x 600 meters with a depth of 200 meters. This crater is located at a depth of more than 300 meters below the caldera wall.
This crater is a large lake with a bluish-green mist and smoke of the sulfur that is stunning. In addition, cold air with temperatures 10° Celsius, the temperature might reach 2° Celsius will increase the sensation of its own experience. Various plants that exist only in the highlands can also be found here, such as Edelweis Flowers and Pine.

From my recent trip to Bromo and Ijen Volcano, East Java.
The best time to start hiking is in the early morning, around 3 or 4 AM. You will be just on time to watch beautiful sunrise peeping through the mountain tops. At 2 PM, the access to the crater is closed due to heavy white sulfuric smoke that makes hiking impossible.