Sannur Cave is made from groundwater traveling inside the Eocene-era limestone of Galala, Egypt. The Sunnur area is dated at approximately 65-million years, and is considered an important geological heritage. It is believed to be the longest cave in Egypt, was discovered in the 1980s, roughly 115 km south-southeast of Cairo. Sannur Cave has only one chamber which is about 700 m long and 20 m in diameter. It is a limestone cave overlaid with alabaster created by thermal springs. Its unique geology and unusual formations of stalactites and stalagmites led it to being recognized as an Egyptian Protectorate in 1992.