Saint Catherine's Monastery (Greek: Μονὴ τῆς Ἁγίας Αἰκατερίνης Moni tes Hagias Aikaterines) lies on the Sinai Peninsula, at the mouth of a gorge at the foot of Mount Sinai in the city of Saint Catherine in Egypt's South Sinai Governorate. The monastery is Orthodox and is a UNESCO World Heritage Site. According to the UNESCO report (60100 ha / Ref: 954), this monastery is one of the oldest working Christian monasteries in the world together with the Monastery of Saint Anthony, situated across the Red Sea in the desert south of Cairo, which also lays claim to that title. The monastery library preserves the second largest collection of early codices and manuscripts in the world, outnumbered only by the Vatican Library. Its strength lies in Greek, Arabic, Armenian, Hebrew, Georgian, Syriac and old Udi texts. The Codex Sinaiticus, now in the British Library, left the monastery in the 19th century for Russia, in circumstances that are now disputed. BY WIKIPEDIA