The charm of Ijen Geopark lies in its uniqueness, covering various aspects of geology, biology, culture, and the natural phenomenon of the blue fire at Mount Ijen. Additionally, the Ijen Crater Lake, known as the most acidic lake in the world, is another highlight of this geopark. The area is also rich in biodiversity, home to 14 types of flora, 27 types of fauna, and 6 types of mammals, making it an important habitat for many species, some of which are rare and protected.