The country code and area code of El Kawah, Sudan is 249, (0)534.
Ahmad Zimam al Haq has written: 'Surga kaldera kawah Ijen'
i personally observed it in kawah village in Kalachitta range and in hari pur at peer ki bandi area.
A well-known crater filled with acid, creating an acid lake, is the Kawah Ijen crater in Indonesia. The lake is known for its striking turquoise color and high acidity due to sulfuric acid from volcanic gases reacting with water. This unique environment is a result of ongoing volcanic activity, making it a fascinating yet hazardous site.